reserve variable for empty root region
This commit is contained in:
Niko Matsakis
parent
771fdd9985
commit
b8caef423d
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@ -472,6 +472,9 @@ pub enum NLLRegionVariableOrigin {
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/// from a `for<'a> T` binder). Meant to represent "any region".
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Placeholder(ty::PlaceholderRegion),
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/// The variable we create to represent `'empty(U0)`.
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RootEmptyRegion,
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Existential {
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/// If this is true, then this variable was created to represent a lifetime
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/// bound in a `for` binder. For example, it might have been created to
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@ -493,6 +496,7 @@ impl NLLRegionVariableOrigin {
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NLLRegionVariableOrigin::FreeRegion => true,
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NLLRegionVariableOrigin::Placeholder(..) => true,
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NLLRegionVariableOrigin::Existential { .. } => false,
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NLLRegionVariableOrigin::RootEmptyRegion => false,
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}
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}
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@ -481,7 +481,8 @@ impl<'tcx> RegionInferenceContext<'tcx> {
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}
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}
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NLLRegionVariableOrigin::Existential { .. } => {
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NLLRegionVariableOrigin::RootEmptyRegion
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| NLLRegionVariableOrigin::Existential { .. } => {
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// For existential, regions, nothing to do.
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}
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}
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@ -1323,7 +1324,8 @@ impl<'tcx> RegionInferenceContext<'tcx> {
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self.check_bound_universal_region(fr, placeholder, errors_buffer);
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}
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NLLRegionVariableOrigin::Existential { .. } => {
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NLLRegionVariableOrigin::RootEmptyRegion
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| NLLRegionVariableOrigin::Existential { .. } => {
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// nothing to check here
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}
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}
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@ -1425,7 +1427,8 @@ impl<'tcx> RegionInferenceContext<'tcx> {
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self.check_bound_universal_region(fr, placeholder, errors_buffer);
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}
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NLLRegionVariableOrigin::Existential { .. } => {
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NLLRegionVariableOrigin::RootEmptyRegion
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| NLLRegionVariableOrigin::Existential { .. } => {
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// nothing to check here
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}
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}
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@ -1698,9 +1701,9 @@ impl<'tcx> RegionInferenceContext<'tcx> {
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universe1.cannot_name(placeholder.universe)
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}
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NLLRegionVariableOrigin::FreeRegion | NLLRegionVariableOrigin::Existential { .. } => {
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false
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}
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NLLRegionVariableOrigin::RootEmptyRegion
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| NLLRegionVariableOrigin::FreeRegion
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| NLLRegionVariableOrigin::Existential { .. } => false,
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}
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}
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@ -2019,7 +2022,8 @@ impl<'tcx> RegionInferenceContext<'tcx> {
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let blame_source = match from_region_origin {
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NLLRegionVariableOrigin::FreeRegion
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| NLLRegionVariableOrigin::Existential { from_forall: false } => true,
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NLLRegionVariableOrigin::Placeholder(_)
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NLLRegionVariableOrigin::RootEmptyRegion
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| NLLRegionVariableOrigin::Placeholder(_)
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| NLLRegionVariableOrigin::Existential { from_forall: true } => false,
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};
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@ -160,10 +160,6 @@ impl<'a, 'b, 'tcx> TypeOutlivesDelegate<'tcx> for &'a mut ConstraintConversion<'
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a: ty::Region<'tcx>,
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b: ty::Region<'tcx>,
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) {
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// FIXME -- this is not the fix I would prefer
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if let ty::ReEmpty(ty::UniverseIndex::ROOT) = a {
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return;
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}
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let b = self.to_region_vid(b);
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let a = self.to_region_vid(a);
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self.add_outlives(b, a);
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@ -176,10 +172,6 @@ impl<'a, 'b, 'tcx> TypeOutlivesDelegate<'tcx> for &'a mut ConstraintConversion<'
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a: ty::Region<'tcx>,
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bound: VerifyBound<'tcx>,
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) {
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// FIXME: I'd prefer if NLL had a notion of empty
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if let ty::ReEmpty(ty::UniverseIndex::ROOT) = a {
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return;
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}
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let type_test = self.verify_to_type_test(kind, a, bound);
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self.add_type_test(type_test);
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}
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@ -54,6 +54,13 @@ pub struct UniversalRegions<'tcx> {
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/// The total number of universal region variables instantiated.
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num_universals: usize,
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/// A special region variable created for the `'empty(U0)` region.
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/// Note that this is **not** a "universal" region, as it doesn't
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/// represent a universally bound placeholder or any such thing.
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/// But we do create it here in this type because it's a useful region
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/// to have around in a few limited cases.
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pub root_empty: RegionVid,
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/// The "defining" type for this function, with all universal
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/// regions instantiated. For a closure or generator, this is the
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/// closure type, but for a top-level function it's the `FnDef`.
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@ -316,7 +323,11 @@ impl<'tcx> UniversalRegions<'tcx> {
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/// See `UniversalRegionIndices::to_region_vid`.
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pub fn to_region_vid(&self, r: ty::Region<'tcx>) -> RegionVid {
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self.indices.to_region_vid(r)
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if let ty::ReEmpty(ty::UniverseIndex::ROOT) = r {
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self.root_empty
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} else {
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self.indices.to_region_vid(r)
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}
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}
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/// As part of the NLL unit tests, you can annotate a function with
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@ -472,10 +483,16 @@ impl<'cx, 'tcx> UniversalRegionsBuilder<'cx, 'tcx> {
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_ => None,
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};
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let root_empty = self
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.infcx
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.next_nll_region_var(NLLRegionVariableOrigin::RootEmptyRegion)
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.to_region_vid();
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UniversalRegions {
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indices,
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fr_static,
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fr_fn_body,
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root_empty,
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first_extern_index,
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first_local_index,
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num_universals,
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@ -13,10 +13,11 @@
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| '_#2r | U0 | {bb0[0..=1], '_#2r}
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| '_#3r | U0 | {bb0[0..=1], '_#3r}
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| '_#4r | U0 | {bb0[0..=1], '_#4r}
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| '_#5r | U0 | {bb0[0..=1], '_#1r}
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| '_#6r | U0 | {bb0[0..=1], '_#2r}
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| '_#7r | U0 | {bb0[0..=1], '_#1r}
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| '_#8r | U0 | {bb0[0..=1], '_#3r}
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| '_#5r | U0 | {}
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| '_#6r | U0 | {bb0[0..=1], '_#1r}
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| '_#7r | U0 | {bb0[0..=1], '_#2r}
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| '_#8r | U0 | {bb0[0..=1], '_#1r}
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| '_#9r | U0 | {bb0[0..=1], '_#3r}
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| Inference Constraints
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| '_#0r live at {bb0[0..=1]}
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@ -24,16 +25,16 @@
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| '_#2r live at {bb0[0..=1]}
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| '_#3r live at {bb0[0..=1]}
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| '_#4r live at {bb0[0..=1]}
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| '_#1r: '_#5r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:26: 12:27)
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| '_#1r: '_#7r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:54: 12:55)
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| '_#2r: '_#6r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:42: 12:43)
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| '_#3r: '_#8r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:66: 12:67)
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| '_#5r: '_#1r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:26: 12:27)
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| '_#6r: '_#2r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:42: 12:43)
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| '_#7r: '_#1r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:54: 12:55)
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| '_#8r: '_#3r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:66: 12:67)
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| '_#1r: '_#6r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:26: 12:27)
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| '_#1r: '_#8r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:54: 12:55)
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| '_#2r: '_#7r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:42: 12:43)
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| '_#3r: '_#9r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:66: 12:67)
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| '_#6r: '_#1r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:26: 12:27)
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| '_#7r: '_#2r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:42: 12:43)
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| '_#8r: '_#1r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:54: 12:55)
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| '_#9r: '_#3r due to BoringNoLocation at All($DIR/named-lifetimes-basic.rs:12:66: 12:67)
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fn use_x(_1: &'_#5r mut i32, _2: &'_#6r u32, _3: &'_#7r u32, _4: &'_#8r u32) -> bool {
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fn use_x(_1: &'_#6r mut i32, _2: &'_#7r u32, _3: &'_#8r u32, _4: &'_#9r u32) -> bool {
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debug w => _1; // in scope 0 at $DIR/named-lifetimes-basic.rs:12:26: 12:27
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debug x => _2; // in scope 0 at $DIR/named-lifetimes-basic.rs:12:42: 12:43
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debug y => _3; // in scope 0 at $DIR/named-lifetimes-basic.rs:12:54: 12:55
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@ -7,7 +7,9 @@
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#![allow(warnings)]
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fn use_x(_: usize) -> bool { true }
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fn use_x(_: usize) -> bool {
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true
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}
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// EMIT_MIR_FOR_EACH_BIT_WIDTH
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// EMIT_MIR rustc.main.nll.0.mir
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@ -7,164 +7,165 @@
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| Inferred Region Values
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| '_#0r | U0 | {bb0[0..=8], bb1[0], bb2[0..=8], bb3[0], bb4[0..=1], bb5[0..=3], bb6[0..=3], bb7[0..=2], bb8[0..=5], '_#0r, '_#1r}
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| '_#1r | U0 | {bb0[0..=8], bb1[0], bb2[0..=8], bb3[0], bb4[0..=1], bb5[0..=3], bb6[0..=3], bb7[0..=2], bb8[0..=5], '_#1r}
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| '_#2r | U0 | {bb2[0..=8], bb3[0], bb5[0..=2]}
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| '_#3r | U0 | {bb2[1..=8], bb3[0], bb5[0..=2]}
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| '_#4r | U0 | {bb2[4..=8], bb3[0], bb5[0..=2]}
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| '_#2r | U0 | {}
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| '_#3r | U0 | {bb2[0..=8], bb3[0], bb5[0..=2]}
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| '_#4r | U0 | {bb2[1..=8], bb3[0], bb5[0..=2]}
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| '_#5r | U0 | {bb2[4..=8], bb3[0], bb5[0..=2]}
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| Inference Constraints
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| '_#0r live at {bb0[0..=8], bb1[0], bb2[0..=8], bb3[0], bb4[0..=1], bb5[0..=3], bb6[0..=3], bb7[0..=2], bb8[0..=5]}
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| '_#1r live at {bb0[0..=8], bb1[0], bb2[0..=8], bb3[0], bb4[0..=1], bb5[0..=3], bb6[0..=3], bb7[0..=2], bb8[0..=5]}
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| '_#2r live at {bb2[0]}
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| '_#3r live at {bb2[1..=3]}
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| '_#4r live at {bb2[4..=8], bb3[0], bb5[0..=2]}
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| '_#2r: '_#3r due to Assignment at Single(bb2[0])
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| '_#3r: '_#4r due to Assignment at Single(bb2[3])
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| '_#3r live at {bb2[0]}
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| '_#4r live at {bb2[1..=3]}
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| '_#5r live at {bb2[4..=8], bb3[0], bb5[0..=2]}
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| '_#3r: '_#4r due to Assignment at Single(bb2[0])
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| '_#4r: '_#5r due to Assignment at Single(bb2[3])
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fn main() -> () {
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let mut _0: (); // return place in scope 0 at $DIR/region-subtyping-basic.rs:14:11: 14:11
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let mut _1: [usize; Const { ty: usize, val: Value(Scalar(0x0000000000000003)) }]; // in scope 0 at $DIR/region-subtyping-basic.rs:15:9: 15:14
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let _3: usize; // in scope 0 at $DIR/region-subtyping-basic.rs:16:16: 16:17
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let mut _4: usize; // in scope 0 at $DIR/region-subtyping-basic.rs:16:14: 16:18
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let mut _5: bool; // in scope 0 at $DIR/region-subtyping-basic.rs:16:14: 16:18
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let mut _7: bool; // in scope 0 at $DIR/region-subtyping-basic.rs:18:8: 18:12
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let _8: bool; // in scope 0 at $DIR/region-subtyping-basic.rs:19:9: 19:18
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let mut _9: usize; // in scope 0 at $DIR/region-subtyping-basic.rs:19:15: 19:17
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let _10: bool; // in scope 0 at $DIR/region-subtyping-basic.rs:21:9: 21:18
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let mut _0: (); // return place in scope 0 at $DIR/region-subtyping-basic.rs:16:11: 16:11
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let mut _1: [usize; Const { ty: usize, val: Value(Scalar(0x0000000000000003)) }]; // in scope 0 at $DIR/region-subtyping-basic.rs:17:9: 17:14
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let _3: usize; // in scope 0 at $DIR/region-subtyping-basic.rs:18:16: 18:17
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let mut _4: usize; // in scope 0 at $DIR/region-subtyping-basic.rs:18:14: 18:18
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let mut _5: bool; // in scope 0 at $DIR/region-subtyping-basic.rs:18:14: 18:18
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let mut _7: bool; // in scope 0 at $DIR/region-subtyping-basic.rs:20:8: 20:12
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let _8: bool; // in scope 0 at $DIR/region-subtyping-basic.rs:21:9: 21:18
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let mut _9: usize; // in scope 0 at $DIR/region-subtyping-basic.rs:21:15: 21:17
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let _10: bool; // in scope 0 at $DIR/region-subtyping-basic.rs:23:9: 23:18
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scope 1 {
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debug v => _1; // in scope 1 at $DIR/region-subtyping-basic.rs:15:9: 15:14
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let _2: &'_#3r usize; // in scope 1 at $DIR/region-subtyping-basic.rs:16:9: 16:10
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debug v => _1; // in scope 1 at $DIR/region-subtyping-basic.rs:17:9: 17:14
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let _2: &'_#4r usize; // in scope 1 at $DIR/region-subtyping-basic.rs:18:9: 18:10
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scope 2 {
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debug p => _2; // in scope 2 at $DIR/region-subtyping-basic.rs:16:9: 16:10
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let _6: &'_#4r usize; // in scope 2 at $DIR/region-subtyping-basic.rs:17:9: 17:10
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debug p => _2; // in scope 2 at $DIR/region-subtyping-basic.rs:18:9: 18:10
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let _6: &'_#5r usize; // in scope 2 at $DIR/region-subtyping-basic.rs:19:9: 19:10
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scope 3 {
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debug q => _6; // in scope 3 at $DIR/region-subtyping-basic.rs:17:9: 17:10
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debug q => _6; // in scope 3 at $DIR/region-subtyping-basic.rs:19:9: 19:10
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}
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}
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}
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bb0: {
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StorageLive(_1); // bb0[0]: scope 0 at $DIR/region-subtyping-basic.rs:15:9: 15:14
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_1 = [const Const(Value(Scalar(0x0000000000000001)): usize), const Const(Value(Scalar(0x0000000000000002)): usize), const Const(Value(Scalar(0x0000000000000003)): usize)]; // bb0[1]: scope 0 at $DIR/region-subtyping-basic.rs:15:17: 15:26
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StorageLive(_1); // bb0[0]: scope 0 at $DIR/region-subtyping-basic.rs:17:9: 17:14
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_1 = [const Const(Value(Scalar(0x0000000000000001)): usize), const Const(Value(Scalar(0x0000000000000002)): usize), const Const(Value(Scalar(0x0000000000000003)): usize)]; // bb0[1]: scope 0 at $DIR/region-subtyping-basic.rs:17:17: 17:26
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// ty::Const
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// + ty: usize
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// + val: Value(Scalar(0x0000000000000001))
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// mir::Constant
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// + span: $DIR/region-subtyping-basic.rs:15:18: 15:19
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// + span: $DIR/region-subtyping-basic.rs:17:18: 17:19
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// + literal: Const { ty: usize, val: Value(Scalar(0x0000000000000001)) }
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// ty::Const
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// + ty: usize
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// + val: Value(Scalar(0x0000000000000002))
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// mir::Constant
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// + span: $DIR/region-subtyping-basic.rs:15:21: 15:22
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// + span: $DIR/region-subtyping-basic.rs:17:21: 17:22
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// + literal: Const { ty: usize, val: Value(Scalar(0x0000000000000002)) }
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// ty::Const
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// + ty: usize
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// + val: Value(Scalar(0x0000000000000003))
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// mir::Constant
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// + span: $DIR/region-subtyping-basic.rs:15:24: 15:25
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// + span: $DIR/region-subtyping-basic.rs:17:24: 17:25
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// + literal: Const { ty: usize, val: Value(Scalar(0x0000000000000003)) }
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FakeRead(ForLet, _1); // bb0[2]: scope 0 at $DIR/region-subtyping-basic.rs:15:9: 15:14
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StorageLive(_2); // bb0[3]: scope 1 at $DIR/region-subtyping-basic.rs:16:9: 16:10
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StorageLive(_3); // bb0[4]: scope 1 at $DIR/region-subtyping-basic.rs:16:16: 16:17
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_3 = const Const(Value(Scalar(0x0000000000000000)): usize); // bb0[5]: scope 1 at $DIR/region-subtyping-basic.rs:16:16: 16:17
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FakeRead(ForLet, _1); // bb0[2]: scope 0 at $DIR/region-subtyping-basic.rs:17:9: 17:14
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StorageLive(_2); // bb0[3]: scope 1 at $DIR/region-subtyping-basic.rs:18:9: 18:10
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StorageLive(_3); // bb0[4]: scope 1 at $DIR/region-subtyping-basic.rs:18:16: 18:17
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_3 = const Const(Value(Scalar(0x0000000000000000)): usize); // bb0[5]: scope 1 at $DIR/region-subtyping-basic.rs:18:16: 18:17
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// ty::Const
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// + ty: usize
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// + val: Value(Scalar(0x0000000000000000))
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// mir::Constant
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// + span: $DIR/region-subtyping-basic.rs:16:16: 16:17
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// + span: $DIR/region-subtyping-basic.rs:18:16: 18:17
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// + literal: Const { ty: usize, val: Value(Scalar(0x0000000000000000)) }
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_4 = Len(_1); // bb0[6]: scope 1 at $DIR/region-subtyping-basic.rs:16:14: 16:18
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_5 = Lt(_3, _4); // bb0[7]: scope 1 at $DIR/region-subtyping-basic.rs:16:14: 16:18
|
||||
assert(move _5, "index out of bounds: the len is {} but the index is {}", move _4, _3) -> [success: bb2, unwind: bb1]; // bb0[8]: scope 1 at $DIR/region-subtyping-basic.rs:16:14: 16:18
|
||||
_4 = Len(_1); // bb0[6]: scope 1 at $DIR/region-subtyping-basic.rs:18:14: 18:18
|
||||
_5 = Lt(_3, _4); // bb0[7]: scope 1 at $DIR/region-subtyping-basic.rs:18:14: 18:18
|
||||
assert(move _5, "index out of bounds: the len is {} but the index is {}", move _4, _3) -> [success: bb2, unwind: bb1]; // bb0[8]: scope 1 at $DIR/region-subtyping-basic.rs:18:14: 18:18
|
||||
}
|
||||
|
||||
bb1 (cleanup): {
|
||||
resume; // bb1[0]: scope 0 at $DIR/region-subtyping-basic.rs:14:1: 23:2
|
||||
resume; // bb1[0]: scope 0 at $DIR/region-subtyping-basic.rs:16:1: 25:2
|
||||
}
|
||||
|
||||
bb2: {
|
||||
_2 = &'_#2r _1[_3]; // bb2[0]: scope 1 at $DIR/region-subtyping-basic.rs:16:13: 16:18
|
||||
FakeRead(ForLet, _2); // bb2[1]: scope 1 at $DIR/region-subtyping-basic.rs:16:9: 16:10
|
||||
StorageLive(_6); // bb2[2]: scope 2 at $DIR/region-subtyping-basic.rs:17:9: 17:10
|
||||
_6 = _2; // bb2[3]: scope 2 at $DIR/region-subtyping-basic.rs:17:13: 17:14
|
||||
FakeRead(ForLet, _6); // bb2[4]: scope 2 at $DIR/region-subtyping-basic.rs:17:9: 17:10
|
||||
StorageLive(_7); // bb2[5]: scope 3 at $DIR/region-subtyping-basic.rs:18:8: 18:12
|
||||
_7 = const Const(Value(Scalar(0x01)): bool); // bb2[6]: scope 3 at $DIR/region-subtyping-basic.rs:18:8: 18:12
|
||||
_2 = &'_#3r _1[_3]; // bb2[0]: scope 1 at $DIR/region-subtyping-basic.rs:18:13: 18:18
|
||||
FakeRead(ForLet, _2); // bb2[1]: scope 1 at $DIR/region-subtyping-basic.rs:18:9: 18:10
|
||||
StorageLive(_6); // bb2[2]: scope 2 at $DIR/region-subtyping-basic.rs:19:9: 19:10
|
||||
_6 = _2; // bb2[3]: scope 2 at $DIR/region-subtyping-basic.rs:19:13: 19:14
|
||||
FakeRead(ForLet, _6); // bb2[4]: scope 2 at $DIR/region-subtyping-basic.rs:19:9: 19:10
|
||||
StorageLive(_7); // bb2[5]: scope 3 at $DIR/region-subtyping-basic.rs:20:8: 20:12
|
||||
_7 = const Const(Value(Scalar(0x01)): bool); // bb2[6]: scope 3 at $DIR/region-subtyping-basic.rs:20:8: 20:12
|
||||
// ty::Const
|
||||
// + ty: bool
|
||||
// + val: Value(Scalar(0x01))
|
||||
// mir::Constant
|
||||
// + span: $DIR/region-subtyping-basic.rs:18:8: 18:12
|
||||
// + span: $DIR/region-subtyping-basic.rs:20:8: 20:12
|
||||
// + literal: Const { ty: bool, val: Value(Scalar(0x01)) }
|
||||
FakeRead(ForMatchedPlace, _7); // bb2[7]: scope 3 at $DIR/region-subtyping-basic.rs:18:8: 18:12
|
||||
switchInt(_7) -> [Const(Value(Scalar(0x00)): bool): bb4, otherwise: bb3]; // bb2[8]: scope 3 at $DIR/region-subtyping-basic.rs:18:5: 22:6
|
||||
FakeRead(ForMatchedPlace, _7); // bb2[7]: scope 3 at $DIR/region-subtyping-basic.rs:20:8: 20:12
|
||||
switchInt(_7) -> [Const(Value(Scalar(0x00)): bool): bb4, otherwise: bb3]; // bb2[8]: scope 3 at $DIR/region-subtyping-basic.rs:20:5: 24:6
|
||||
}
|
||||
|
||||
bb3: {
|
||||
falseEdges -> [real: bb5, imaginary: bb4]; // bb3[0]: scope 3 at $DIR/region-subtyping-basic.rs:18:5: 22:6
|
||||
falseEdges -> [real: bb5, imaginary: bb4]; // bb3[0]: scope 3 at $DIR/region-subtyping-basic.rs:20:5: 24:6
|
||||
}
|
||||
|
||||
bb4: {
|
||||
StorageLive(_10); // bb4[0]: scope 3 at $DIR/region-subtyping-basic.rs:21:9: 21:18
|
||||
_10 = const Const(Value(Scalar(<ZST>)): fn(usize) -> bool {use_x})(const Const(Value(Scalar(0x0000000000000016)): usize)) -> [return: bb7, unwind: bb1]; // bb4[1]: scope 3 at $DIR/region-subtyping-basic.rs:21:9: 21:18
|
||||
StorageLive(_10); // bb4[0]: scope 3 at $DIR/region-subtyping-basic.rs:23:9: 23:18
|
||||
_10 = const Const(Value(Scalar(<ZST>)): fn(usize) -> bool {use_x})(const Const(Value(Scalar(0x0000000000000016)): usize)) -> [return: bb7, unwind: bb1]; // bb4[1]: scope 3 at $DIR/region-subtyping-basic.rs:23:9: 23:18
|
||||
// ty::Const
|
||||
// + ty: fn(usize) -> bool {use_x}
|
||||
// + val: Value(Scalar(<ZST>))
|
||||
// mir::Constant
|
||||
// + span: $DIR/region-subtyping-basic.rs:23:9: 23:14
|
||||
// + literal: Const { ty: fn(usize) -> bool {use_x}, val: Value(Scalar(<ZST>)) }
|
||||
// ty::Const
|
||||
// + ty: usize
|
||||
// + val: Value(Scalar(0x0000000000000016))
|
||||
// mir::Constant
|
||||
// + span: $DIR/region-subtyping-basic.rs:23:15: 23:17
|
||||
// + literal: Const { ty: usize, val: Value(Scalar(0x0000000000000016)) }
|
||||
}
|
||||
|
||||
bb5: {
|
||||
StorageLive(_8); // bb5[0]: scope 3 at $DIR/region-subtyping-basic.rs:21:9: 21:18
|
||||
StorageLive(_9); // bb5[1]: scope 3 at $DIR/region-subtyping-basic.rs:21:15: 21:17
|
||||
_9 = (*_6); // bb5[2]: scope 3 at $DIR/region-subtyping-basic.rs:21:15: 21:17
|
||||
_8 = const Const(Value(Scalar(<ZST>)): fn(usize) -> bool {use_x})(move _9) -> [return: bb6, unwind: bb1]; // bb5[3]: scope 3 at $DIR/region-subtyping-basic.rs:21:9: 21:18
|
||||
// ty::Const
|
||||
// + ty: fn(usize) -> bool {use_x}
|
||||
// + val: Value(Scalar(<ZST>))
|
||||
// mir::Constant
|
||||
// + span: $DIR/region-subtyping-basic.rs:21:9: 21:14
|
||||
// + literal: Const { ty: fn(usize) -> bool {use_x}, val: Value(Scalar(<ZST>)) }
|
||||
// ty::Const
|
||||
// + ty: usize
|
||||
// + val: Value(Scalar(0x0000000000000016))
|
||||
// mir::Constant
|
||||
// + span: $DIR/region-subtyping-basic.rs:21:15: 21:17
|
||||
// + literal: Const { ty: usize, val: Value(Scalar(0x0000000000000016)) }
|
||||
}
|
||||
|
||||
bb5: {
|
||||
StorageLive(_8); // bb5[0]: scope 3 at $DIR/region-subtyping-basic.rs:19:9: 19:18
|
||||
StorageLive(_9); // bb5[1]: scope 3 at $DIR/region-subtyping-basic.rs:19:15: 19:17
|
||||
_9 = (*_6); // bb5[2]: scope 3 at $DIR/region-subtyping-basic.rs:19:15: 19:17
|
||||
_8 = const Const(Value(Scalar(<ZST>)): fn(usize) -> bool {use_x})(move _9) -> [return: bb6, unwind: bb1]; // bb5[3]: scope 3 at $DIR/region-subtyping-basic.rs:19:9: 19:18
|
||||
// ty::Const
|
||||
// + ty: fn(usize) -> bool {use_x}
|
||||
// + val: Value(Scalar(<ZST>))
|
||||
// mir::Constant
|
||||
// + span: $DIR/region-subtyping-basic.rs:19:9: 19:14
|
||||
// + literal: Const { ty: fn(usize) -> bool {use_x}, val: Value(Scalar(<ZST>)) }
|
||||
}
|
||||
|
||||
bb6: {
|
||||
StorageDead(_9); // bb6[0]: scope 3 at $DIR/region-subtyping-basic.rs:19:17: 19:18
|
||||
StorageDead(_8); // bb6[1]: scope 3 at $DIR/region-subtyping-basic.rs:19:18: 19:19
|
||||
_0 = const Const(Value(Scalar(<ZST>)): ()); // bb6[2]: scope 3 at $DIR/region-subtyping-basic.rs:18:13: 20:6
|
||||
StorageDead(_9); // bb6[0]: scope 3 at $DIR/region-subtyping-basic.rs:21:17: 21:18
|
||||
StorageDead(_8); // bb6[1]: scope 3 at $DIR/region-subtyping-basic.rs:21:18: 21:19
|
||||
_0 = const Const(Value(Scalar(<ZST>)): ()); // bb6[2]: scope 3 at $DIR/region-subtyping-basic.rs:20:13: 22:6
|
||||
// ty::Const
|
||||
// + ty: ()
|
||||
// + val: Value(Scalar(<ZST>))
|
||||
// mir::Constant
|
||||
// + span: $DIR/region-subtyping-basic.rs:18:13: 20:6
|
||||
// + span: $DIR/region-subtyping-basic.rs:20:13: 22:6
|
||||
// + literal: Const { ty: (), val: Value(Scalar(<ZST>)) }
|
||||
goto -> bb8; // bb6[3]: scope 3 at $DIR/region-subtyping-basic.rs:18:5: 22:6
|
||||
goto -> bb8; // bb6[3]: scope 3 at $DIR/region-subtyping-basic.rs:20:5: 24:6
|
||||
}
|
||||
|
||||
bb7: {
|
||||
StorageDead(_10); // bb7[0]: scope 3 at $DIR/region-subtyping-basic.rs:21:18: 21:19
|
||||
_0 = const Const(Value(Scalar(<ZST>)): ()); // bb7[1]: scope 3 at $DIR/region-subtyping-basic.rs:20:12: 22:6
|
||||
StorageDead(_10); // bb7[0]: scope 3 at $DIR/region-subtyping-basic.rs:23:18: 23:19
|
||||
_0 = const Const(Value(Scalar(<ZST>)): ()); // bb7[1]: scope 3 at $DIR/region-subtyping-basic.rs:22:12: 24:6
|
||||
// ty::Const
|
||||
// + ty: ()
|
||||
// + val: Value(Scalar(<ZST>))
|
||||
// mir::Constant
|
||||
// + span: $DIR/region-subtyping-basic.rs:20:12: 22:6
|
||||
// + span: $DIR/region-subtyping-basic.rs:22:12: 24:6
|
||||
// + literal: Const { ty: (), val: Value(Scalar(<ZST>)) }
|
||||
goto -> bb8; // bb7[2]: scope 3 at $DIR/region-subtyping-basic.rs:18:5: 22:6
|
||||
goto -> bb8; // bb7[2]: scope 3 at $DIR/region-subtyping-basic.rs:20:5: 24:6
|
||||
}
|
||||
|
||||
bb8: {
|
||||
StorageDead(_6); // bb8[0]: scope 2 at $DIR/region-subtyping-basic.rs:23:1: 23:2
|
||||
StorageDead(_3); // bb8[1]: scope 1 at $DIR/region-subtyping-basic.rs:23:1: 23:2
|
||||
StorageDead(_2); // bb8[2]: scope 1 at $DIR/region-subtyping-basic.rs:23:1: 23:2
|
||||
StorageDead(_1); // bb8[3]: scope 0 at $DIR/region-subtyping-basic.rs:23:1: 23:2
|
||||
StorageDead(_7); // bb8[4]: scope 0 at $DIR/region-subtyping-basic.rs:23:1: 23:2
|
||||
return; // bb8[5]: scope 0 at $DIR/region-subtyping-basic.rs:23:2: 23:2
|
||||
StorageDead(_6); // bb8[0]: scope 2 at $DIR/region-subtyping-basic.rs:25:1: 25:2
|
||||
StorageDead(_3); // bb8[1]: scope 1 at $DIR/region-subtyping-basic.rs:25:1: 25:2
|
||||
StorageDead(_2); // bb8[2]: scope 1 at $DIR/region-subtyping-basic.rs:25:1: 25:2
|
||||
StorageDead(_1); // bb8[3]: scope 0 at $DIR/region-subtyping-basic.rs:25:1: 25:2
|
||||
StorageDead(_7); // bb8[4]: scope 0 at $DIR/region-subtyping-basic.rs:25:1: 25:2
|
||||
return; // bb8[5]: scope 0 at $DIR/region-subtyping-basic.rs:25:2: 25:2
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -7,15 +7,16 @@
|
|||
| Inferred Region Values
|
||||
| '_#0r | U0 | {bb0[0..=22], '_#0r, '_#1r}
|
||||
| '_#1r | U0 | {bb0[0..=22], '_#1r}
|
||||
| '_#2r | U0 | {bb0[10..=11]}
|
||||
| '_#3r | U0 | {bb0[11]}
|
||||
| '_#2r | U0 | {}
|
||||
| '_#3r | U0 | {bb0[10..=11]}
|
||||
| '_#4r | U0 | {bb0[11]}
|
||||
|
|
||||
| Inference Constraints
|
||||
| '_#0r live at {bb0[0..=22]}
|
||||
| '_#1r live at {bb0[0..=22]}
|
||||
| '_#2r live at {bb0[10]}
|
||||
| '_#3r live at {bb0[11]}
|
||||
| '_#2r: '_#3r due to Assignment at Single(bb0[10])
|
||||
| '_#3r live at {bb0[10]}
|
||||
| '_#4r live at {bb0[11]}
|
||||
| '_#3r: '_#4r due to Assignment at Single(bb0[10])
|
||||
|
|
||||
fn main() -> () {
|
||||
let mut _0: (); // return place in scope 0 at $DIR/storage_ranges.rs:3:11: 3:11
|
||||
|
|
|
|||
|
|
@ -34,7 +34,7 @@ LL | | (a, b)
|
|||
LL | | }
|
||||
| |_^
|
||||
|
|
||||
= note: hidden type `(&u8, &u8)` captures lifetime '_#4r
|
||||
= note: hidden type `(&u8, &u8)` captures lifetime '_#5r
|
||||
|
||||
error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
|
||||
--> $DIR/ret-impl-trait-no-fg.rs:9:1
|
||||
|
|
@ -48,7 +48,7 @@ LL | | (a, b)
|
|||
LL | | }
|
||||
| |_^
|
||||
|
|
||||
= note: hidden type `(&u8, &u8)` captures lifetime '_#5r
|
||||
= note: hidden type `(&u8, &u8)` captures lifetime '_#6r
|
||||
|
||||
error: aborting due to 5 previous errors
|
||||
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@ error: higher-ranked subtype error
|
|||
--> $DIR/due-to-where-clause.rs:2:5
|
||||
|
|
||||
LL | test::<FooS>(&mut 42);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
|
|
|
|||
|
|
@ -4,7 +4,7 @@ error[E0700]: hidden type for `impl Trait` captures lifetime that does not appea
|
|||
LL | fn upper_bounds<'a, 'b, 'c, 'd, 'e>(a: Ordinary<'a>, b: Ordinary<'b>) -> impl Trait<'d, 'e>
|
||||
| ^^^^^^^^^^^^^^^^^^
|
||||
|
|
||||
= note: hidden type `Ordinary<'_>` captures lifetime '_#8r
|
||||
= note: hidden type `Ordinary<'_>` captures lifetime '_#9r
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
|
|
|
|||
|
|
@ -4,7 +4,7 @@ error[E0700]: hidden type for `impl Trait` captures lifetime that does not appea
|
|||
LL | fn upper_bounds<'a, 'b>(a: Ordinary<'a>, b: Ordinary<'b>) -> impl Trait<'a, 'b>
|
||||
| ^^^^^^^^^^^^^^^^^^
|
||||
|
|
||||
= note: hidden type `Ordinary<'_>` captures lifetime '_#5r
|
||||
= note: hidden type `Ordinary<'_>` captures lifetime '_#6r
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,15 @@
|
|||
// Regression test for issue #68550.
|
||||
//
|
||||
// The `&'static A:` where clause was triggering
|
||||
// ICEs because it wound up being compiled to reference
|
||||
// the `'empty(U0)` region.
|
||||
|
||||
fn run<'a, A>(x: A)
|
||||
where
|
||||
A: 'static,
|
||||
&'static A: ,
|
||||
{
|
||||
let _: &'a A = &x; //~ ERROR `x` does not live long enough
|
||||
}
|
||||
|
||||
fn main() {}
|
||||
|
|
@ -0,0 +1,16 @@
|
|||
error[E0597]: `x` does not live long enough
|
||||
--> $DIR/issue-68550.rs:12:20
|
||||
|
|
||||
LL | fn run<'a, A>(x: A)
|
||||
| -- lifetime `'a` defined here
|
||||
...
|
||||
LL | let _: &'a A = &x;
|
||||
| ----- ^^ borrowed value does not live long enough
|
||||
| |
|
||||
| type annotation requires that `x` is borrowed for `'a`
|
||||
LL | }
|
||||
| - `x` dropped here while still borrowed
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
For more information about this error, try `rustc --explain E0597`.
|
||||
Loading…
Reference in New Issue