Silence some warnings

src/base.rs

@@ -283,6 +283,7 @@ fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Backend>) {
 
 fn trans_stmt<'tcx>(
     fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+    #[allow(unused_variables)]
     cur_block: Block,
     stmt: &Statement<'tcx>,
 ) {

src/debuginfo/mod.rs

@@ -124,10 +124,10 @@ impl<'tcx> DebugContext<'tcx> {
             ty::Uint(_) => primitive(&mut self.dwarf, gimli::DW_ATE_unsigned),
             ty::Int(_) => primitive(&mut self.dwarf, gimli::DW_ATE_signed),
             ty::Float(_) => primitive(&mut self.dwarf, gimli::DW_ATE_float),
-            ty::Ref(_, pointee_ty, mutbl)
+            ty::Ref(_, pointee_ty, _mutbl)
             | ty::RawPtr(ty::TypeAndMut {
                 ty: pointee_ty,
-                mutbl,
+                mutbl: _mutbl,
             }) => {
                 let type_id = new_entry(&mut self.dwarf, gimli::DW_TAG_pointer_type);
 

src/intrinsics/mod.rs

@@ -44,6 +44,7 @@ macro intrinsic_match {
     $(
         $($($name:tt).*)|+ $(if $cond:expr)?, $(<$($subst:ident),*>)? ($($a:ident $arg:ident),*) $content:block;
     )*) => {
+        let _ = $substs; // Silence warning when substs is unused.
         match $intrinsic {
             $(
                 $(intrinsic_pat!($($name).*))|* $(if $cond)? => {

src/intrinsics/simd.rs

@@ -17,7 +17,7 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
     intrinsic_match! {
         fx, intrinsic, substs, args,
         _ => {
-            fx.tcx.sess.fatal(&format!("Unknown SIMD intrinsic {}", intrinsic));
+            fx.tcx.sess.span_fatal(span, &format!("Unknown SIMD intrinsic {}", intrinsic));
         };
 
         simd_cast, (c a) {
@@ -104,7 +104,7 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
             }
         };
 
-        simd_insert, (c base, o idx, v val) {
+        simd_insert, (c base, o idx, v _val) {
             let idx_const = if let Some(idx_const) = crate::constant::mir_operand_get_const_val(fx, idx) {
                 idx_const
             } else {

src/optimize/stack2reg.rs

@@ -155,7 +155,7 @@ impl<'a> OptimizeContext<'a> {
 
 pub(super) fn optimize_function<T: std::fmt::Debug>(
     ctx: &mut Context,
-    clif_comments: &mut crate::pretty_clif::CommentWriter,
+    _clif_comments: &mut crate::pretty_clif::CommentWriter,
     name: T,
 ) {
     combine_stack_addr_with_load_store(&mut ctx.func);