resolve: Model resolve_legacy_scope after resolve_lexical_macro_path_segment

src/test/ui/macros/macro-shadowing.rs

@@ -17,14 +17,14 @@ macro_rules! macro_one { () => {} }
 #[macro_use(macro_two)] extern crate two_macros;
 
 macro_rules! m1 { () => {
-    macro_rules! foo { () => {} } //~ ERROR `foo` is already in scope
+    macro_rules! foo { () => {} }
 
     #[macro_use] //~ ERROR `macro_two` is already in scope
     extern crate two_macros as __;
 }}
 m1!();
 
-foo!();
+foo!(); //~ ERROR `foo` is ambiguous
 
 macro_rules! m2 { () => {
     macro_rules! foo { () => {} }

src/test/ui/macros/macro-shadowing.stderr

@@ -9,16 +9,27 @@ LL | m1!();
    |
    = note: macro-expanded `#[macro_use]`s may not shadow existing macros (see RFC 1560)
 
-error: `foo` is already in scope
+error[E0659]: `foo` is ambiguous
+  --> $DIR/macro-shadowing.rs:27:1
+   |
+LL | foo!(); //~ ERROR `foo` is ambiguous
+   | ^^^
+   |
+note: `foo` could refer to the name defined here
   --> $DIR/macro-shadowing.rs:20:5
    |
-LL |     macro_rules! foo { () => {} } //~ ERROR `foo` is already in scope
+LL |     macro_rules! foo { () => {} }
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 ...
 LL | m1!();
    | ------ in this macro invocation
+note: `foo` could also refer to the name defined here
+  --> $DIR/macro-shadowing.rs:15:1
    |
-   = note: macro-expanded `macro_rules!`s may not shadow existing macros (see RFC 1560)
+LL | macro_rules! foo { () => {} }
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = note: macro-expanded macros do not shadow
 
 error: aborting due to 2 previous errors
 
+For more information about this error, try `rustc --explain E0659`.

src/test/ui/out-of-order-shadowing.rs

@@ -9,11 +9,10 @@
 // except according to those terms.
 
 // aux-build:define_macro.rs
-// error-pattern: `bar` is already in scope
 
 macro_rules! bar { () => {} }
 define_macro!(bar);
-bar!();
+bar!(); //~ ERROR `bar` is ambiguous
 
 macro_rules! m { () => { #[macro_use] extern crate define_macro; } }
 m!();

src/test/ui/out-of-order-shadowing.stderr

@@ -1,11 +1,22 @@
-error: `bar` is already in scope
+error[E0659]: `bar` is ambiguous
   --> $DIR/out-of-order-shadowing.rs:15:1
    |
+LL | bar!(); //~ ERROR `bar` is ambiguous
+   | ^^^
+   |
+note: `bar` could refer to the name defined here
+  --> $DIR/out-of-order-shadowing.rs:14:1
+   |
 LL | define_macro!(bar);
    | ^^^^^^^^^^^^^^^^^^^
+note: `bar` could also refer to the name defined here
+  --> $DIR/out-of-order-shadowing.rs:13:1
    |
-   = note: macro-expanded `macro_rules!`s may not shadow existing macros (see RFC 1560)
+LL | macro_rules! bar { () => {} }
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = note: macro-expanded macros do not shadow
    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
 
 error: aborting due to previous error
 
+For more information about this error, try `rustc --explain E0659`.