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

src/test/ui/macros/assert.stderr

@@ -16,7 +16,7 @@ error: macro requires a boolean expression as an argument
 LL |     debug_assert!();
    |     ^^^^^^^^^^^^^^^^ boolean expression required
    |
-   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z macro-backtrace for more info)
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: expected expression, found keyword `struct`
   --> $DIR/assert.rs:5:19

src/test/ui/macros/cfg.stderr

@@ -3,6 +3,8 @@ error: macro requires a cfg-pattern as an argument
    |
 LL |     cfg!();
    |     ^^^^^^^ cfg-pattern required
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: expected identifier, found `123`
   --> $DIR/cfg.rs:3:10

src/test/ui/macros/derive-in-eager-expansion-hang.stderr

@@ -12,6 +12,7 @@ LL | |     }
 LL |       format_args!(hang!());
    |                    ------- in this macro invocation
    |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 help: you might be missing a string literal to format with
    |
 LL |     format_args!("{}", hang!());

src/test/ui/macros/format-parse-errors.stderr

@@ -4,7 +4,7 @@ error: requires at least a format string argument
 LL |     format!();
    |     ^^^^^^^^^^
    |
-   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z macro-backtrace for more info)
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: expected expression, found keyword `struct`
   --> $DIR/format-parse-errors.rs:5:13

src/test/ui/macros/issue-54441.stderr

@@ -6,6 +6,8 @@ LL |         let
 ...
 LL |     m!();
    |     ----- 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/macros/macro-backtrace-invalid-internals.stderr

@@ -6,6 +6,8 @@ LL |           1.fake()
 ...
 LL |     fake_method_stmt!();
    |     -------------------- in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0610]: `{integer}` is a primitive type and therefore doesn't have fields
   --> $DIR/macro-backtrace-invalid-internals.rs:11:13
@@ -15,6 +17,8 @@ LL |           1.fake
 ...
 LL |     fake_field_stmt!();
    |     ------------------- in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0610]: `{integer}` is a primitive type and therefore doesn't have fields
   --> $DIR/macro-backtrace-invalid-internals.rs:17:15
@@ -24,6 +28,8 @@ LL |           (1).0
 ...
 LL |     fake_anon_field_stmt!();
    |     ------------------------ in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0689]: can't call method `neg` on ambiguous numeric type `{float}`
   --> $DIR/macro-backtrace-invalid-internals.rs:41:15
@@ -34,6 +40,7 @@ LL |           2.0.neg()
 LL |     real_method_stmt!();
    |     -------------------- in this macro invocation
    |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 help: you must specify a concrete type for this numeric value, like `f32`
    |
 LL |           2.0_f32.neg()
@@ -47,6 +54,8 @@ LL |           1.fake()
 ...
 LL |     let _ = fake_method_expr!();
    |             ------------------- in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0610]: `{integer}` is a primitive type and therefore doesn't have fields
   --> $DIR/macro-backtrace-invalid-internals.rs:29:13
@@ -56,6 +65,8 @@ LL |           1.fake
 ...
 LL |     let _ = fake_field_expr!();
    |             ------------------ in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0610]: `{integer}` is a primitive type and therefore doesn't have fields
   --> $DIR/macro-backtrace-invalid-internals.rs:35:15
@@ -65,6 +76,8 @@ LL |           (1).0
 ...
 LL |     let _ = fake_anon_field_expr!();
    |             ----------------------- in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0689]: can't call method `neg` on ambiguous numeric type `{float}`
   --> $DIR/macro-backtrace-invalid-internals.rs:47:15
@@ -75,6 +88,7 @@ LL |           2.0.neg()
 LL |     let _ = real_method_expr!();
    |             ------------------- in this macro invocation
    |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 help: you must specify a concrete type for this numeric value, like `f32`
    |
 LL |           2.0_f32.neg()

src/test/ui/macros/macro-backtrace-nested.stderr

@@ -6,6 +6,8 @@ LL |     () => (fake)
 ...
 LL |     1 + call_nested_expr!();
    |         ------------------- in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0425]: cannot find value `fake` in this scope
   --> $DIR/macro-backtrace-nested.rs:5:12
@@ -15,6 +17,8 @@ LL |     () => (fake)
 ...
 LL |     call_nested_expr_sum!();
    |     ------------------------ 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/macros/macro-backtrace-println.stderr

@@ -6,6 +6,8 @@ LL |     ($fmt:expr) => (myprint!(concat!($fmt, "\n")));
 ...
 LL |     myprintln!("{}");
    |     ----------------- 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/macros/macro-context.stderr

@@ -39,6 +39,8 @@ LL |     () => ( i ; typeof );
 ...
 LL |     m!();
    |     ----- 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 4 previous errors
 

src/test/ui/macros/macro-lifetime-used-with-labels.stderr

@@ -8,4 +8,6 @@ LL |     'b: loop {
    |     -- first declared here
 LL |         br2!('b);
    |         --------- in this macro invocation
+   |
+   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 

src/test/ui/macros/macro-local-data-key-priv.stderr

@@ -9,7 +9,7 @@ note: the constant `baz` is defined here
    |
 LL |     thread_local!(static baz: f64 = 0.0);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z macro-backtrace for more info)
+   = 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/macros/macro-shadowing.stderr

@@ -8,6 +8,7 @@ LL | m1!();
    | ------ in this macro invocation
    |
    = note: macro-expanded `#[macro_use]`s may not shadow existing macros (see RFC 1560)
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `foo` is ambiguous (macro-expanded name vs less macro-expanded name from outer scope during import/macro resolution)
   --> $DIR/macro-shadowing.rs:17:1
@@ -28,6 +29,7 @@ note: `foo` could also refer to the macro defined here
    |
 LL | macro_rules! foo { () => {} }
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = 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/macros/macros-nonfatal-errors.stderr

@@ -3,6 +3,8 @@ error[E0665]: `Default` cannot be derived for enums, only structs
    |
 LL | #[derive(Default)]
    |          ^^^^^^^
+   |
+   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: inline assembly must be a string literal
   --> $DIR/macros-nonfatal-errors.rs:13:10
@@ -68,6 +70,8 @@ error: couldn't read $DIR/i'd be quite surprised if a file with this name existe
    |
 LL |     include_str!("i'd be quite surprised if a file with this name existed");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: argument must be a string literal
   --> $DIR/macros-nonfatal-errors.rs:28:20
@@ -80,6 +84,8 @@ error: couldn't read $DIR/i'd be quite surprised if a file with this name existe
    |
 LL |     include_bytes!("i'd be quite surprised if a file with this name existed");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: trace_macros! accepts only `true` or `false`
   --> $DIR/macros-nonfatal-errors.rs:31:5

src/test/ui/macros/must-use-in-macro-55516.stderr

@@ -6,5 +6,5 @@ LL |     write!(&mut example, "{}", 42);
    |
    = note: `-W unused-must-use` implied by `-W unused`
    = note: this `Result` may be an `Err` variant, which should be handled
-   = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z macro-backtrace for more info)
+   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 

src/test/ui/macros/nonterminal-matching.stderr

@@ -9,6 +9,8 @@ LL |     n!(a $nt_item b);
 ...
 LL | complex_nonterminal!(enum E {});
    | -------------------------------- 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/macros/restricted-shadowing-legacy.stderr

@@ -23,6 +23,7 @@ LL |         macro_rules! m { () => {} }
 ...
 LL | include!();
    | ----------- in this macro invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `m` is ambiguous (macro-expanded name vs less macro-expanded name from outer scope during import/macro resolution)
   --> $DIR/restricted-shadowing-legacy.rs:139:42
@@ -49,6 +50,7 @@ LL |         macro_rules! m { () => {} }
 ...
 LL | include!();
    | ----------- in this macro invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `m` is ambiguous (macro-expanded name vs less macro-expanded name from outer scope during import/macro resolution)
   --> $DIR/restricted-shadowing-legacy.rs:148:9
@@ -75,6 +77,7 @@ LL |         macro_rules! m { () => {} }
 ...
 LL | include!();
    | ----------- in this macro invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `m` is ambiguous (macro-expanded name vs less macro-expanded name from outer scope during import/macro resolution)
   --> $DIR/restricted-shadowing-legacy.rs:164:9
@@ -101,6 +104,7 @@ LL |         macro_rules! m { () => { Wrong } }
 ...
 LL | include!();
    | ----------- in this macro invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `m` is ambiguous (macro-expanded name vs less macro-expanded name from outer scope during import/macro resolution)
   --> $DIR/restricted-shadowing-legacy.rs:180:13
@@ -127,6 +131,7 @@ LL |         macro_rules! m { () => { Wrong } }
 ...
 LL | include!();
    | ----------- in this macro invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `m` is ambiguous (macro-expanded name vs less macro-expanded name from outer scope during import/macro resolution)
   --> $DIR/restricted-shadowing-legacy.rs:218:42
@@ -153,6 +158,7 @@ LL |         macro_rules! m { () => { Wrong } }
 ...
 LL | include!();
    | ----------- in this macro invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `m` is ambiguous (macro-expanded name vs less macro-expanded name from outer scope during import/macro resolution)
   --> $DIR/restricted-shadowing-legacy.rs:232:9
@@ -179,6 +185,7 @@ LL |             macro_rules! m { () => {} }
 ...
 LL | include!();
    | ----------- in this macro invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `m` is ambiguous (macro-expanded name vs less macro-expanded name from outer scope during import/macro resolution)
   --> $DIR/restricted-shadowing-legacy.rs:262:42
@@ -205,6 +212,7 @@ LL |             macro_rules! m { () => {} }
 ...
 LL | include!();
    | ----------- 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 8 previous errors
 

src/test/ui/macros/restricted-shadowing-modern.stderr

@@ -23,6 +23,7 @@ LL |         macro m() {}
 ...
 LL | include!();
    | ----------- in this macro invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `m` is ambiguous (macro-expanded name vs less macro-expanded name from outer scope during import/macro resolution)
   --> $DIR/restricted-shadowing-modern.rs:147:33
@@ -49,6 +50,7 @@ LL |         macro m() {}
 ...
 LL | include!();
    | ----------- in this macro invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `m` is ambiguous (macro-expanded name vs less macro-expanded name from outer scope during import/macro resolution)
   --> $DIR/restricted-shadowing-modern.rs:156:13
@@ -75,6 +77,7 @@ LL |         macro m() {}
 ...
 LL | include!();
    | ----------- in this macro invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `m` is ambiguous (macro-expanded name vs less macro-expanded name from outer scope during import/macro resolution)
   --> $DIR/restricted-shadowing-modern.rs:172:13
@@ -101,6 +104,7 @@ LL |         macro m() { Wrong }
 ...
 LL | include!();
    | ----------- in this macro invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `m` is ambiguous (macro-expanded name vs less macro-expanded name from outer scope during import/macro resolution)
   --> $DIR/restricted-shadowing-modern.rs:190:17
@@ -127,6 +131,7 @@ LL |         macro m() { Wrong }
 ...
 LL | include!();
    | ----------- in this macro invocation
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `m` is ambiguous (macro-expanded name vs less macro-expanded name from outer scope during import/macro resolution)
   --> $DIR/restricted-shadowing-modern.rs:233:33
@@ -153,6 +158,7 @@ LL |         macro m() { Wrong }
 ...
 LL | include!();
    | ----------- 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 6 previous errors
 

src/test/ui/macros/same-sequence-span.stderr

@@ -28,6 +28,7 @@ LL | | fn main() {}
 ...  |
    |
    = note: allowed there are: `=>`, `,` or `;`
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: `$x:expr` may be followed by `=`, which is not allowed for `expr` fragments
   --> $DIR/same-sequence-span.rs:19:1
@@ -36,6 +37,7 @@ LL | proc_macro_sequence::make_foo!();
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not allowed after `expr` fragments
    |
    = note: allowed there are: `=>`, `,` or `;`
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 4 previous errors
 

src/test/ui/macros/span-covering-argument-1.stderr

@@ -8,6 +8,8 @@ LL |             *&mut $s = 0;
 ...
 LL |     bad!(foo whatever);
    |     ------------------- 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/macros/trace_faulty_macros.stderr

@@ -9,6 +9,8 @@ LL |         my_faulty_macro!(bcd);
 ...
 LL |     my_faulty_macro!();
    |     ------------------- in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: trace_macro
   --> $DIR/trace_faulty_macros.rs:33:5
@@ -30,6 +32,7 @@ LL |     my_recursive_macro!();
    |     ---------------------- in this macro invocation
    |
    = help: consider adding a `#![recursion_limit="8"]` attribute to your crate (`trace_faulty_macros`)
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: trace_macro
   --> $DIR/trace_faulty_macros.rs:34:5