auto merge of #10142 : pythonesque/rust/issue-8263, r=catamorphism

This is, I think, the minimal change required.  I would have included a test but as far as I can tell there is currently no way to precisely test that the span for an error underlines the correct word.  I did verify it manually.

Author: bors

src/librustc/middle/moves.rs

@@ -420,7 +420,7 @@ impl VisitContext {
                     // specified and (2) have a type that
                     // moves-by-default:
                     let consume_with = with_fields.iter().any(|tf| {
-                        !fields.iter().any(|f| f.ident.name == tf.ident.name) &&
+                        !fields.iter().any(|f| f.ident.node.name == tf.ident.name) &&
                             ty::type_moves_by_default(self.tcx, tf.mt.ty)
                     });
 

src/librustc/middle/privacy.rs

@@ -716,15 +716,15 @@ impl<'self> Visitor<()> for PrivacyVisitor<'self> {
                 match ty::get(ty::expr_ty(self.tcx, expr)).sty {
                     ty::ty_struct(id, _) => {
                         for field in (*fields).iter() {
-                            self.check_field(expr.span, id, field.ident);
+                            self.check_field(expr.span, id, field.ident.node);
                         }
                     }
                     ty::ty_enum(_, _) => {
                         match self.tcx.def_map.get_copy(&expr.id) {
                             ast::DefVariant(_, variant_id, _) => {
                                 for field in fields.iter() {
                                     self.check_field(expr.span, variant_id,
-                                                     field.ident);
+                                                     field.ident.node);
                                 }
                             }
                             _ => self.tcx.sess.span_bug(expr.span,

src/librustc/middle/trans/consts.rs

@@ -508,7 +508,7 @@ fn const_expr_unadjusted(cx: @mut CrateContext,
                   |discr, field_tys| {
                   let cs = field_tys.iter().enumerate()
                       .map(|(ix, &field_ty)| {
-                      match fs.iter().find(|f| field_ty.ident.name == f.ident.name) {
+                      match fs.iter().find(|f| field_ty.ident.name == f.ident.node.name) {
                           Some(f) => const_expr(cx, (*f).expr),
                           None => {
                               match base_val {

src/librustc/middle/trans/expr.rs

@@ -1211,7 +1211,7 @@ fn trans_rec_or_struct(bcx: @mut Block,
         let numbered_fields = do fields.map |field| {
             let opt_pos =
                 field_tys.iter().position(|field_ty|
-                                          field_ty.ident.name == field.ident.name);
+                                          field_ty.ident.name == field.ident.node.name);
             match opt_pos {
                 Some(i) => {
                     need_base[i] = false;

src/librustc/middle/typeck/check/mod.rs

@@ -2009,6 +2009,7 @@ pub fn check_expr_with_unifier(fcx: @mut FnCtxt,
     }
 
     fn check_struct_or_variant_fields(fcx: @mut FnCtxt,
+                                      struct_ty: ty::t,
                                       span: Span,
                                       class_id: ast::DefId,
                                       node_id: ast::NodeId,
@@ -2030,28 +2031,30 @@ pub fn check_expr_with_unifier(fcx: @mut FnCtxt,
         for field in ast_fields.iter() {
             let mut expected_field_type = ty::mk_err();
 
-            let pair = class_field_map.find(&field.ident.name).map(|x| *x);
+            let pair = class_field_map.find(&field.ident.node.name).map(|x| *x);
             match pair {
                 None => {
-                    tcx.sess.span_err(
-                        field.span,
-                        format!("structure has no field named `{}`",
-                             tcx.sess.str_of(field.ident)));
+                    fcx.type_error_message(
+                      field.ident.span,
+                      |actual| {
+                          format!("structure `{}` has no field named `{}`",
+                                  actual, tcx.sess.str_of(field.ident.node))
+                    }, struct_ty, None);
                     error_happened = true;
                 }
                 Some((_, true)) => {
                     tcx.sess.span_err(
-                        field.span,
+                        field.ident.span,
                         format!("field `{}` specified more than once",
-                             tcx.sess.str_of(field.ident)));
+                             tcx.sess.str_of(field.ident.node)));
                     error_happened = true;
                 }
                 Some((field_id, false)) => {
                     expected_field_type =
                         ty::lookup_field_type(
                             tcx, class_id, field_id, &substitutions);
                     class_field_map.insert(
-                        field.ident.name, (field_id, true));
+                        field.ident.node.name, (field_id, true));
                     fields_found += 1;
                 }
             }
@@ -2161,6 +2164,7 @@ pub fn check_expr_with_unifier(fcx: @mut FnCtxt,
         // Look up and check the fields.
         let class_fields = ty::lookup_struct_fields(tcx, class_id);
         check_struct_or_variant_fields(fcx,
+                                           struct_type,
                                            span,
                                            class_id,
                                            id,
@@ -2248,6 +2252,7 @@ pub fn check_expr_with_unifier(fcx: @mut FnCtxt,
         // Look up and check the enum variant fields.
         let variant_fields = ty::lookup_struct_fields(tcx, variant_id);
         check_struct_or_variant_fields(fcx,
+                                       enum_type,
                                        span,
                                        variant_id,
                                        id,

src/libsyntax/ast.rs

@@ -471,11 +471,13 @@ pub struct Arm {
 
 #[deriving(Clone, Eq, Encodable, Decodable, IterBytes)]
 pub struct Field {
-    ident: Ident,
+    ident: SpannedIdent,
     expr: @Expr,
     span: Span,
 }
 
+pub type SpannedIdent = Spanned<Ident>;
+
 #[deriving(Clone, Eq, Encodable, Decodable, IterBytes)]
 pub enum BlockCheckMode {
     DefaultBlock,

src/libsyntax/ext/build.rs

@@ -529,7 +529,7 @@ impl AstBuilder for @ExtCtxt {
         self.expr(b.span, ast::ExprBlock(b))
     }
     fn field_imm(&self, span: Span, name: Ident, e: @ast::Expr) -> ast::Field {
-        ast::Field { ident: name, expr: e, span: span }
+        ast::Field { ident: respan(span, name), expr: e, span: span }
     }
     fn expr_struct(&self, span: Span, path: ast::Path, fields: ~[ast::Field]) -> @ast::Expr {
         self.expr(span, ast::ExprStruct(path, fields, None))

src/libsyntax/fold.rs

@@ -10,7 +10,7 @@
 
 use ast::*;
 use ast;
-use codemap::{Span, Spanned};
+use codemap::{respan, Span, Spanned};
 use parse::token;
 use opt_vec::OptVec;
 
@@ -551,7 +551,7 @@ fn fold_struct_field<T:ast_fold>(f: @struct_field, fld: &T) -> @struct_field {
 
 fn fold_field_<T:ast_fold>(field: Field, folder: &T) -> Field {
     ast::Field {
-        ident: folder.fold_ident(field.ident),
+        ident: respan(field.ident.span, folder.fold_ident(field.ident.node)),
         expr: folder.fold_expr(field.expr),
         span: folder.new_span(field.span),
     }
@@ -797,7 +797,8 @@ pub fn noop_fold_expr<T:ast_fold>(e: @ast::Expr, folder: &T) -> @ast::Expr {
                          folder.fold_expr(er))
         }
         ExprField(el, id, ref tys) => {
-            ExprField(folder.fold_expr(el), folder.fold_ident(id),
+            ExprField(folder.fold_expr(el),
+                      folder.fold_ident(id),
                       tys.map(|x| folder.fold_ty(x)))
         }
         ExprIndex(callee_id, el, er) => {

src/libsyntax/parse/parser.rs

@@ -1549,10 +1549,11 @@ impl Parser {
     pub fn parse_field(&self) -> Field {
         let lo = self.span.lo;
         let i = self.parse_ident();
+        let hi = self.last_span.hi;
         self.expect(&token::COLON);
         let e = self.parse_expr();
         ast::Field {
-            ident: i,
+            ident: spanned(lo, hi, i),
             expr: e,
             span: mk_sp(lo, e.span.hi),
         }

src/libsyntax/print/pprust.rs

@@ -1111,7 +1111,7 @@ pub fn print_call_post(s: @ps,
 pub fn print_expr(s: @ps, expr: &ast::Expr) {
     fn print_field(s: @ps, field: &ast::Field) {
         ibox(s, indent_unit);
-        print_ident(s, field.ident);
+        print_ident(s, field.ident.node);
         word_space(s, ":");
         print_expr(s, field.expr);
         end(s);

src/test/compile-fail/issue-4736.rs

@@ -11,5 +11,5 @@
 struct NonCopyable(());
 
 fn main() {
-    let z = NonCopyable{ p: () }; //~ ERROR structure has no field named `p`
+    let z = NonCopyable{ p: () }; //~ ERROR structure `NonCopyable` has no field named `p`
 }

src/test/compile-fail/struct-fields-too-many.rs

@@ -15,6 +15,6 @@ struct BuildData {
 fn main() {
     let foo = BuildData {
         foo: 0,
-        bar: 0 //~ ERROR structure has no field named `bar`
+        bar: 0 //~ ERROR structure `BuildData` has no field named `bar`
     };
 }