Use proper span for break and continue labels

Fixes #28109

src/librustc/middle/cfg/construct.rs

@@ -284,7 +284,7 @@ impl<'a, 'tcx> CFGBuilder<'a, 'tcx> {
             }
 
             hir::ExprBreak(label) => {
-                let loop_scope = self.find_scope(expr, label);
+                let loop_scope = self.find_scope(expr, label.map(|l| l.node));
                 let b = self.add_ast_node(expr.id, &[pred]);
                 self.add_exiting_edge(expr, b,
                                       loop_scope, loop_scope.break_index);
@@ -292,7 +292,7 @@ impl<'a, 'tcx> CFGBuilder<'a, 'tcx> {
             }
 
             hir::ExprAgain(label) => {
-                let loop_scope = self.find_scope(expr, label);
+                let loop_scope = self.find_scope(expr, label.map(|l| l.node));
                 let a = self.add_ast_node(expr.id, &[pred]);
                 self.add_exiting_edge(expr, a,
                                       loop_scope, loop_scope.continue_index);

src/librustc/middle/liveness.rs

@@ -1049,7 +1049,7 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
 
           hir::ExprBreak(opt_label) => {
               // Find which label this break jumps to
-              let sc = self.find_loop_scope(opt_label, expr.id, expr.span);
+              let sc = self.find_loop_scope(opt_label.map(|l| l.node), expr.id, expr.span);
 
               // Now that we know the label we're going to,
               // look it up in the break loop nodes table
@@ -1063,7 +1063,7 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
 
           hir::ExprAgain(opt_label) => {
               // Find which label this expr continues to
-              let sc = self.find_loop_scope(opt_label, expr.id, expr.span);
+              let sc = self.find_loop_scope(opt_label.map(|l| l.node), expr.id, expr.span);
 
               // Now that we know the label we're going to,
               // look it up in the continue loop nodes table

src/librustc_back/svh.rs

@@ -277,8 +277,8 @@ mod svh_visitor {
             ExprRange(..)            => SawExprRange,
             ExprPath(ref qself, _)   => SawExprPath(qself.as_ref().map(|q| q.position)),
             ExprAddrOf(m, _)         => SawExprAddrOf(m),
-            ExprBreak(id)            => SawExprBreak(id.map(|id| id.name.as_str())),
+            ExprBreak(id)            => SawExprBreak(id.map(|id| id.node.name.as_str())),
-            ExprAgain(id)            => SawExprAgain(id.map(|id| id.name.as_str())),
+            ExprAgain(id)            => SawExprAgain(id.map(|id| id.node.name.as_str())),
             ExprRet(..)              => SawExprRet,
             ExprInlineAsm(ref asm)   => SawExprInlineAsm(asm),
             ExprStruct(..)           => SawExprStruct,

src/librustc_resolve/lib.rs

@@ -3759,12 +3759,12 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
             }
 
             ExprBreak(Some(label)) | ExprAgain(Some(label)) => {
-                let renamed = mtwt::resolve(label);
+                let renamed = mtwt::resolve(label.node);
                 match self.search_label(renamed) {
                     None => {
                         resolve_error(self,
-                                      expr.span,
+                                      label.span,
-                                      ResolutionError::UndeclaredLabel(&label.name.as_str()))
+                                      ResolutionError::UndeclaredLabel(&label.node.name.as_str()))
                     }
                     Some(DlDef(def @ DefLabel(_))) => {
                         // Since this def is a label, it is never read.

src/librustc_trans/trans/expr.rs

@@ -937,10 +937,10 @@ fn trans_rvalue_stmt_unadjusted<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
             trans_into(bcx, &**e, Ignore)
         }
         hir::ExprBreak(label_opt) => {
-            controlflow::trans_break(bcx, expr, label_opt)
+            controlflow::trans_break(bcx, expr, label_opt.map(|l| l.node))
         }
         hir::ExprAgain(label_opt) => {
-            controlflow::trans_cont(bcx, expr, label_opt)
+            controlflow::trans_cont(bcx, expr, label_opt.map(|l| l.node))
         }
         hir::ExprRet(ref ex) => {
             // Check to see if the return expression itself is reachable.

src/libsyntax/ast.rs

@@ -891,9 +891,9 @@ pub enum Expr_ {
     /// A referencing operation (`&a` or `&mut a`)
     ExprAddrOf(Mutability, P<Expr>),
     /// A `break`, with an optional label to break
-    ExprBreak(Option<Ident>),
+    ExprBreak(Option<SpannedIdent>),
     /// A `continue`, with an optional label
-    ExprAgain(Option<Ident>),
+    ExprAgain(Option<SpannedIdent>),
     /// A `return`, with an optional value to be returned
     ExprRet(Option<P<Expr>>),
 

src/libsyntax/fold.rs

@@ -1299,8 +1299,14 @@ pub fn noop_fold_expr<T: Folder>(Expr {id, node, span}: Expr, folder: &mut T) ->
                 });
                 ExprPath(qself, folder.fold_path(path))
             }
-            ExprBreak(opt_ident) => ExprBreak(opt_ident.map(|x| folder.fold_ident(x))),
+            ExprBreak(opt_ident) => ExprBreak(opt_ident.map(|label|
-            ExprAgain(opt_ident) => ExprAgain(opt_ident.map(|x| folder.fold_ident(x))),
+                respan(folder.new_span(label.span),
+                       folder.fold_ident(label.node)))
+            ),
+            ExprAgain(opt_ident) => ExprAgain(opt_ident.map(|label|
+                respan(folder.new_span(label.span),
+                       folder.fold_ident(label.node)))
+            ),
             ExprRet(e) => ExprRet(e.map(|x| folder.fold_expr(x))),
             ExprInlineAsm(InlineAsm {
                 inputs,

src/libsyntax/parse/parser.rs

@@ -2143,9 +2143,12 @@ impl<'a> Parser<'a> {
                 }
                 if try!(self.eat_keyword(keywords::Continue) ){
                     let ex = if self.token.is_lifetime() {
-                        let lifetime = self.get_lifetime();
+                        let ex = ExprAgain(Some(Spanned{
+                            node: self.get_lifetime(),
+                            span: self.span
+                        }));
                         try!(self.bump());
-                        ExprAgain(Some(lifetime))
+                        ex
                     } else {
                         ExprAgain(None)
                     };
@@ -2161,7 +2164,6 @@ impl<'a> Parser<'a> {
                         UnsafeBlock(ast::UserProvided));
                 }
                 if try!(self.eat_keyword(keywords::Return) ){
-                    // RETURN expression
                     if self.token.can_begin_expr() {
                         let e = try!(self.parse_expr_nopanic());
                         hi = e.span.hi;
@@ -2170,11 +2172,12 @@ impl<'a> Parser<'a> {
                         ex = ExprRet(None);
                     }
                 } else if try!(self.eat_keyword(keywords::Break) ){
-                    // BREAK expression
                     if self.token.is_lifetime() {
-                        let lifetime = self.get_lifetime();
+                        ex = ExprBreak(Some(Spanned {
+                            node: self.get_lifetime(),
+                            span: self.span
+                        }));
                         try!(self.bump());
-                        ex = ExprBreak(Some(lifetime));
                     } else {
                         ex = ExprBreak(None);
                     }

src/libsyntax/print/pprust.rs

@@ -1911,7 +1911,7 @@ impl<'a> State<'a> {
                 try!(word(&mut self.s, "break"));
                 try!(space(&mut self.s));
                 if let Some(ident) = opt_ident {
-                    try!(self.print_ident(ident));
+                    try!(self.print_ident(ident.node));
                     try!(space(&mut self.s));
                 }
             }
@@ -1919,7 +1919,7 @@ impl<'a> State<'a> {
                 try!(word(&mut self.s, "continue"));
                 try!(space(&mut self.s));
                 if let Some(ident) = opt_ident {
-                    try!(self.print_ident(ident));
+                    try!(self.print_ident(ident.node));
                     try!(space(&mut self.s))
                 }
             }