Improve diagnostics when constant pattern is too generic
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@ -16,7 +16,7 @@ use rustc_hir::pat_util::EnumerateAndAdjustIterator;
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use rustc_hir::RangeEnd;
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use rustc_hir::RangeEnd;
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use rustc_index::vec::Idx;
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use rustc_index::vec::Idx;
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use rustc_middle::mir::interpret::{get_slice_bytes, sign_extend, ConstValue};
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use rustc_middle::mir::interpret::{get_slice_bytes, sign_extend, ConstValue};
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use rustc_middle::mir::interpret::{LitToConstError, LitToConstInput};
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use rustc_middle::mir::interpret::{ErrorHandled, LitToConstError, LitToConstInput};
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use rustc_middle::mir::UserTypeProjection;
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use rustc_middle::mir::UserTypeProjection;
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use rustc_middle::mir::{BorrowKind, Field, Mutability};
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use rustc_middle::mir::{BorrowKind, Field, Mutability};
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use rustc_middle::ty::subst::{GenericArg, SubstsRef};
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use rustc_middle::ty::subst::{GenericArg, SubstsRef};
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@ -834,6 +834,12 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
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pattern
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pattern
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}
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}
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}
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}
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Err(ErrorHandled::TooGeneric) => {
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// While `Reported | Linted` cases will have diagnostics emitted already
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// it is not true for TooGeneric case, so we need to give user more information.
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self.tcx.sess.span_err(span, "constant pattern depends on a generic parameter");
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pat_from_kind(PatKind::Wild)
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}
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Err(_) => {
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Err(_) => {
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self.tcx.sess.span_err(span, "could not evaluate constant pattern");
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self.tcx.sess.span_err(span, "could not evaluate constant pattern");
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pat_from_kind(PatKind::Wild)
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pat_from_kind(PatKind::Wild)
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