rustc_macros: don't limit the -Zmacro-backtrace suggestion to extern macros.

src/test/ui/parser/issue-65122-mac-invoc-in-mut-patterns.stderr

@@ -8,6 +8,7 @@ LL |     mac1! { does_not_exist!() }
    |     --------------------------- in this macro invocation
    |
    = note: `mut` may be followed by `variable` and `variable @ pattern`
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: expected identifier, found `does_not_exist!()`
   --> $DIR/issue-65122-mac-invoc-in-mut-patterns.rs:13:17
@@ -17,6 +18,8 @@ LL |         let mut $eval = ();
 ...
 LL |     mac2! { does_not_exist!() }
    |     --------------------------- in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: `mut` must be followed by a named binding
   --> $DIR/issue-65122-mac-invoc-in-mut-patterns.rs:13:13
@@ -28,6 +31,7 @@ LL |     mac2! { does_not_exist!() }
    |     --------------------------- in this macro invocation
    |
    = note: `mut` may be followed by `variable` and `variable @ pattern`
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: cannot find macro `does_not_exist` in this scope
   --> $DIR/issue-65122-mac-invoc-in-mut-patterns.rs:20:13

src/test/ui/parser/macro/issue-37113.stderr

@@ -6,6 +6,8 @@ LL |             $( $t, )*
 ...
 LL |     test_macro!(String,);
    |     --------------------- in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to previous error
 

src/test/ui/parser/macro/issue-37234.stderr

@@ -6,6 +6,8 @@ LL |         let x = 5 "";
 ...
 LL |     failed!();
    |     ---------- in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to previous error
 

src/test/ui/parser/macro/macro-incomplete-parse.stderr

@@ -17,6 +17,8 @@ LL |     () => ( 1,
 ...
 LL |     ignored_expr!();
    |     ---------------- in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: macro expansion ignores token `,` and any following
   --> $DIR/macro-incomplete-parse.rs:16:14

src/test/ui/parser/macro/pub-item-macro.stderr

@@ -8,6 +8,7 @@ LL |     pub_x!();
    |     --------- in this macro invocation
    |
    = help: try adjusting the macro to put `pub` inside the invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0603]: static `x` is private
   --> $DIR/pub-item-macro.rs:17:23
@@ -23,6 +24,7 @@ LL |     static x: u32 = 0;
 ...
 LL |     pub_x!();
    |     --------- in this macro invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 2 previous errors
 

src/test/ui/parser/macro/trait-non-item-macros.stderr

@@ -6,6 +6,8 @@ LL |     ($a:expr) => ($a)
 ...
 LL |     bah!(2);
    |     -------- in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to previous error
 

src/test/ui/parser/mut-patterns.stderr

@@ -99,6 +99,8 @@ LL |             let mut $p = 0;
 ...
 LL |     foo!(x);
    |     -------- in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 12 previous errors
 

src/test/ui/parser/recover-range-pats.stderr

@@ -166,6 +166,8 @@ LL |             let ...$e;
 ...
 LL |     mac!(0);
    |     -------- in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0586]: inclusive range with no end
   --> $DIR/recover-range-pats.rs:141:19
@@ -177,6 +179,7 @@ LL |     mac!(0);
    |     -------- in this macro invocation
    |
    = note: inclusive ranges must be bounded at the end (`..=b` or `a..=b`)
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0586]: inclusive range with no end
   --> $DIR/recover-range-pats.rs:142:19
@@ -188,6 +191,7 @@ LL |     mac!(0);
    |     -------- in this macro invocation
    |
    = note: inclusive ranges must be bounded at the end (`..=b` or `a..=b`)
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: `...` range patterns are deprecated
   --> $DIR/recover-range-pats.rs:42:13
@@ -251,6 +255,8 @@ LL |             let $e1...$e2;
 ...
 LL |     mac2!(0, 1);
    |     ------------ in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0029]: only char and numeric types are allowed in range patterns
   --> $DIR/recover-range-pats.rs:20:12