make backtrace header a bit more visible

Author: RalfJung

src/diagnostics.rs

@@ -352,7 +352,7 @@ fn report_msg<'mir, 'tcx>(
     }
     if notes.len() + helps.len() > 0 {
         // Add visual separator before backtrace.
-        err.note("backtrace:");
+        err.note("BACKTRACE:");
     }
     // Add backtrace
     for (idx, frame_info) in stacktrace.iter().enumerate() {

tests/extern-so/fail/function_not_in_so.stderr

@@ -5,7 +5,7 @@ LL |         foo();
    |         ^^^^^ can't call foreign function: foo
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support
-   = note: backtrace:
+   = note: BACKTRACE:
    = note: inside `main` at $DIR/function_not_in_so.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

tests/fail/alloc/deallocate-bad-alignment.stderr

@@ -6,7 +6,7 @@ LL |     unsafe { __rust_dealloc(ptr, layout.size(), layout.align()) }
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: backtrace:
+   = note: BACKTRACE:
    = note: inside `std::alloc::dealloc` at RUSTLIB/alloc/src/alloc.rs:LL:CC
 note: inside `main` at $DIR/deallocate-bad-alignment.rs:LL:CC
   --> $DIR/deallocate-bad-alignment.rs:LL:CC

tests/fail/alloc/deallocate-bad-size.stderr

@@ -6,7 +6,7 @@ LL |     unsafe { __rust_dealloc(ptr, layout.size(), layout.align()) }
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: backtrace:
+   = note: BACKTRACE:
    = note: inside `std::alloc::dealloc` at RUSTLIB/alloc/src/alloc.rs:LL:CC
 note: inside `main` at $DIR/deallocate-bad-size.rs:LL:CC
   --> $DIR/deallocate-bad-size.rs:LL:CC

tests/fail/alloc/deallocate-twice.stderr

@@ -6,7 +6,7 @@ LL |     unsafe { __rust_dealloc(ptr, layout.size(), layout.align()) }
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: backtrace:
+   = note: BACKTRACE:
    = note: inside `std::alloc::dealloc` at RUSTLIB/alloc/src/alloc.rs:LL:CC
 note: inside `main` at $DIR/deallocate-twice.rs:LL:CC
   --> $DIR/deallocate-twice.rs:LL:CC

tests/fail/alloc/global_system_mixup.stderr

@@ -6,7 +6,7 @@ LL |         FREE();
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: backtrace:
+   = note: BACKTRACE:
    = note: inside `std::sys::PLATFORM::alloc::<impl std::alloc::GlobalAlloc for std::alloc::System>::dealloc` at RUSTLIB/std/src/sys/PLATFORM/alloc.rs:LL:CC
    = note: inside `<std::alloc::System as std::alloc::Allocator>::deallocate` at RUSTLIB/std/src/alloc.rs:LL:CC
 note: inside `main` at $DIR/global_system_mixup.rs:LL:CC

tests/fail/alloc/no_global_allocator.stderr

@@ -5,7 +5,7 @@ LL |         __rust_alloc(1, 1);
    |         ^^^^^^^^^^^^^^^^^^ can't call foreign function: __rust_alloc
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support
-   = note: backtrace:
+   = note: BACKTRACE:
    = note: inside `start` at $DIR/no_global_allocator.rs:LL:CC
 
 error: aborting due to previous error

tests/fail/alloc/reallocate-bad-size.stderr

@@ -6,7 +6,7 @@ LL |     unsafe { __rust_realloc(ptr, layout.size(), layout.align(), new_size) }
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: backtrace:
+   = note: BACKTRACE:
    = note: inside `std::alloc::realloc` at RUSTLIB/alloc/src/alloc.rs:LL:CC
 note: inside `main` at $DIR/reallocate-bad-size.rs:LL:CC
   --> $DIR/reallocate-bad-size.rs:LL:CC

tests/fail/alloc/reallocate-change-alloc.stderr

@@ -6,7 +6,7 @@ LL |         let _z = *x;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: backtrace:
+   = note: BACKTRACE:
    = note: inside `main` at $DIR/reallocate-change-alloc.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

tests/fail/alloc/reallocate-dangling.stderr

@@ -6,7 +6,7 @@ LL |     unsafe { __rust_realloc(ptr, layout.size(), layout.align(), new_size) }
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: backtrace:
+   = note: BACKTRACE:
    = note: inside `std::alloc::realloc` at RUSTLIB/alloc/src/alloc.rs:LL:CC
 note: inside `main` at $DIR/reallocate-dangling.rs:LL:CC
   --> $DIR/reallocate-dangling.rs:LL:CC