Auto merge of #60250 - Centril:rollup-d9tehhr, r=Centril

Rollup of 6 pull requests

Successful merges:

 - #59560 (MIR generation cleanup)
 - #59697 (tweak unresolved label suggestion)
 - #60038 (Add codegen test for PGO instrumentation.)
 - #60160 (Fix #58270, fix off-by-one error in error diagnostics.)
 - #60185 (Reexport IntErrorKind in std)
 - #60243 (Add regression test for #53249.)

Failed merges:

r? @ghost

Author: bors

src/bootstrap/test.rs

@@ -1268,11 +1268,11 @@ impl Step for Compiletest {
         builder.add_rust_test_threads(&mut cmd);
 
         if builder.config.sanitizers {
-            cmd.env("SANITIZER_SUPPORT", "1");
+            cmd.env("RUSTC_SANITIZER_SUPPORT", "1");
         }
 
         if builder.config.profiler {
-            cmd.env("PROFILER_SUPPORT", "1");
+            cmd.env("RUSTC_PROFILER_SUPPORT", "1");
         }
 
         cmd.env("RUST_TEST_TMPDIR", builder.out.join("tmp"));

src/librustc_errors/emitter.rs

@@ -268,6 +268,7 @@ impl EmitterWriter {
                 // 6..7. This is degenerate input, but it's best to degrade
                 // gracefully -- and the parser likes to supply a span like
                 // that for EOF, in particular.
+
                 if lo.col_display == hi.col_display && lo.line == hi.line {
                     hi.col_display += 1;
                 }
@@ -547,6 +548,15 @@ impl EmitterWriter {
                     && j > i                      // multiline lines).
                     && p == 0  // We're currently on the first line, move the label one line down
                 {
+                    // If we're overlapping with an un-labelled annotation with the same span
+                    // we can just merge them in the output
+                    if next.start_col == annotation.start_col
+                    && next.end_col == annotation.end_col
+                    && !next.has_label()
+                    {
+                        continue;
+                    }
+
                     // This annotation needs a new line in the output.
                     p += 1;
                     break;

src/librustc_mir/build/expr/as_rvalue.rs

@@ -150,10 +150,6 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
                 let source = unpack!(block = this.as_operand(block, scope, source));
                 block.and(Rvalue::Cast(CastKind::Misc, source, expr.ty))
             }
-            ExprKind::Use { source } => {
-                let source = unpack!(block = this.as_operand(block, scope, source));
-                block.and(Rvalue::Use(source))
-            }
             ExprKind::Pointer { cast, source } => {
                 let source = unpack!(block = this.as_operand(block, scope, source));
                 block.and(Rvalue::Cast(CastKind::Pointer(cast), source, expr.ty))
@@ -363,6 +359,7 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
             | ExprKind::Match { .. }
             | ExprKind::If { .. }
             | ExprKind::NeverToAny { .. }
+            | ExprKind::Use { .. }
             | ExprKind::Loop { .. }
             | ExprKind::LogicalOp { .. }
             | ExprKind::Call { .. }

src/librustc_mir/build/expr/category.rs

@@ -48,6 +48,7 @@ impl Category {
             | ExprKind::If { .. }
             | ExprKind::Match { .. }
             | ExprKind::NeverToAny { .. }
+            | ExprKind::Use { .. }
             | ExprKind::Call { .. } => Some(Category::Rvalue(RvalueFunc::Into)),
 
             ExprKind::Array { .. }
@@ -58,7 +59,6 @@ impl Category {
             | ExprKind::Binary { .. }
             | ExprKind::Box { .. }
             | ExprKind::Cast { .. }
-            | ExprKind::Use { .. }
             | ExprKind::Pointer { .. }
             | ExprKind::Repeat { .. }
             | ExprKind::Borrow { .. }

src/librustc_mir/build/expr/into.rs

@@ -327,6 +327,9 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
                     success.unit()
                 }
             }
+            ExprKind::Use { source } => {
+                this.into(destination, block, source)
+            }
 
             // These cases don't actually need a destination
             ExprKind::Assign { .. }
@@ -379,7 +382,6 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
             | ExprKind::Binary { .. }
             | ExprKind::Box { .. }
             | ExprKind::Cast { .. }
-            | ExprKind::Use { .. }
             | ExprKind::Pointer { .. }
             | ExprKind::Repeat { .. }
             | ExprKind::Borrow { .. }

src/librustc_mir/build/mod.rs

@@ -147,7 +147,21 @@ pub fn mir_build<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId) -> Mir<'t
             build::construct_fn(cx, id, arguments, safety, abi,
                                 return_ty, yield_ty, return_ty_span, body)
         } else {
-            build::construct_const(cx, body_id, return_ty_span)
+            // Get the revealed type of this const. This is *not* the adjusted
+            // type of its body, which may be a subtype of this type. For
+            // example:
+            //
+            // fn foo(_: &()) {}
+            // static X: fn(&'static ()) = foo;
+            //
+            // The adjusted type of the body of X is `for<'a> fn(&'a ())` which
+            // is not the same as the type of X. We need the type of the return
+            // place to be the type of the constant because NLL typeck will
+            // equate them.
+
+            let return_ty = cx.tables().node_type(id);
+
+            build::construct_const(cx, body_id, return_ty, return_ty_span)
         };
 
         // Convert the Mir to global types.
@@ -730,16 +744,25 @@ fn construct_fn<'a, 'gcx, 'tcx, A>(hir: Cx<'a, 'gcx, 'tcx>,
 fn construct_const<'a, 'gcx, 'tcx>(
     hir: Cx<'a, 'gcx, 'tcx>,
     body_id: hir::BodyId,
-    ty_span: Span,
+    const_ty: Ty<'tcx>,
+    const_ty_span: Span,
 ) -> Mir<'tcx> {
     let tcx = hir.tcx();
-    let ast_expr = &tcx.hir().body(body_id).value;
-    let ty = hir.tables().expr_ty_adjusted(ast_expr);
     let owner_id = tcx.hir().body_owner(body_id);
     let span = tcx.hir().span(owner_id);
-    let mut builder = Builder::new(hir, span, 0, Safety::Safe, ty, ty_span, vec![], vec![]);
+    let mut builder = Builder::new(
+        hir,
+        span,
+        0,
+        Safety::Safe,
+        const_ty,
+        const_ty_span,
+        vec![],
+        vec![],
+    );
 
     let mut block = START_BLOCK;
+    let ast_expr = &tcx.hir().body(body_id).value;
     let expr = builder.hir.mirror(ast_expr);
     unpack!(block = builder.into_expr(&Place::RETURN_PLACE, block, expr));
 

src/librustc_mir/interpret/step.rs

@@ -259,8 +259,7 @@ impl<'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>> InterpretCx<'a, 'mir, 'tcx, M>
                 )?;
             }
 
-            Cast(kind, ref operand, cast_ty) => {
-                debug_assert_eq!(self.monomorphize(cast_ty)?, dest.layout.ty);
+            Cast(kind, ref operand, _) => {
                 let src = self.eval_operand(operand, None)?;
                 self.cast(src, kind, dest)?;
             }

src/librustc_resolve/lib.rs

@@ -364,7 +364,12 @@ fn resolve_struct_error<'sess, 'a>(resolver: &'sess Resolver<'_>,
                                            "use of undeclared label `{}`",
                                            name);
             if let Some(lev_candidate) = lev_candidate {
-                err.span_label(span, format!("did you mean `{}`?", lev_candidate));
+                err.span_suggestion(
+                    span,
+                    "a label with a similar name exists in this scope",
+                    lev_candidate.to_string(),
+                    Applicability::MaybeIncorrect,
+                );
             } else {
                 err.span_label(span, format!("undeclared label `{}`", name));
             }
@@ -4280,7 +4285,13 @@ impl<'a> Resolver<'a> {
                         // Picks the first label that is "close enough", which is not necessarily
                         // the closest match
                         let close_match = self.search_label(label.ident, |rib, ident| {
-                            let names = rib.bindings.iter().map(|(id, _)| &id.name);
+                            let names = rib.bindings.iter().filter_map(|(id, _)| {
+                                if id.span.ctxt() == label.ident.span.ctxt() {
+                                    Some(&id.name)
+                                } else {
+                                    None
+                                }
+                            });
                             find_best_match_for_name(names, &*ident.as_str(), None)
                         });
                         self.record_def(expr.id, err_path_resolution());

src/librustc_typeck/check/mod.rs

@@ -866,6 +866,8 @@ fn typeck_tables_of<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 
             fcx.check_expr_coercable_to_type(&body.value, revealed_ty);
 
+            fcx.write_ty(id, revealed_ty);
+
             fcx
         };
 

src/librustc_typeck/check/writeback.rs

@@ -42,6 +42,14 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
         for arg in &body.arguments {
             wbcx.visit_node_id(arg.pat.span, arg.hir_id);
         }
+        // Type only exists for constants and statics, not functions.
+        match self.tcx.hir().body_owner_kind(item_id) {
+            hir::BodyOwnerKind::Const | hir::BodyOwnerKind::Static(_) => {
+                let item_hir_id = self.tcx.hir().node_to_hir_id(item_id);
+                wbcx.visit_node_id(body.value.span, item_hir_id);
+            }
+            hir::BodyOwnerKind::Closure | hir::BodyOwnerKind::Fn => (),
+        }
         wbcx.visit_body(body);
         wbcx.visit_upvar_capture_map();
         wbcx.visit_upvar_list_map();