Calibrate span for method call error messages

Specifically, the method parameter cardinality mismatch or missing
method error message span now gets method itself exactly. It was the
whole expression.

Closes #9390
Closes #13684
Closes #13709

1 files changed, 3 insertions, 2 deletions

diff --git a/src/libsyntax/ext/build.rs b/src/libsyntax/ext/build.rs
index e1174ea6cc4..d5465303394 100644
--- a/src/libsyntax/ext/build.rs
+++ b/src/libsyntax/ext/build.rs
@@ -12,7 +12,7 @@ use abi;
 use ast::{P, Ident};
 use ast;
 use ast_util;
-use codemap::{Span, respan, DUMMY_SP};
+use codemap::{Span, respan, Spanned, DUMMY_SP};
 use ext::base::ExtCtxt;
 use ext::quote::rt::*;
 use fold::Folder;
@@ -548,8 +548,9 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
                         expr: @ast::Expr,
                         ident: ast::Ident,
                         mut args: Vec<@ast::Expr> ) -> @ast::Expr {
+        let id = Spanned { node: ident, span: span };
         args.unshift(expr);
-        self.expr(span, ast::ExprMethodCall(ident, Vec::new(), args))
+        self.expr(span, ast::ExprMethodCall(id, Vec::new(), args))
     }
     fn expr_block(&self, b: P<ast::Block>) -> @ast::Expr {
         self.expr(b.span, ast::ExprBlock(b))