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Github Show macro name in 'this error originates in macro' message by Aaron1011...

 4 years ago
source link: https://github.com/rust-lang/rust/pull/82069
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@@ -5,7 +5,7 @@ LL | static A: usize = 0;

| ^^^^^^^^^^^^^^^^^^^^ the trait `GlobalAlloc` is not implemented for `usize`

|

= note: required by `std::alloc::GlobalAlloc::alloc`

= note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)

= note: this error originates in the attribute macro `global_allocator` (in Nightly builds, run with -Z macro-backtrace for more info)

jyn514 on Feb 13

Member

Unrelated to this PR, but would it be possible to only show "run with -Z macro-backtrace" in nightly builds, the same way the compiler only suggests #![feature] on nightly?

camelid on Feb 14

Member

For months I've thought of suggesting this but kept forgetting, so thanks for suggesting it!

Aaron1011 on Mar 4

Author

Member

This can be a very useful option for debugging macros, so I think it's good to make people aware of it. Unlike #![feature]s, this option is something can be enabled just for local testing, without requiring that anyone else use a nightly compiler.

estebank 25 days ago

Contributor

@Aaron1011's observation is exactly the reason I didn't gate that suggestion on being in nightly.


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