tracing-attributes: support const values for target and name (backport v0.1.x) #2942
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…tion (tokio-rs#2883) ## Motivation Const argumetns in `level!` macros do not work when in the first position. This also seems to have fixed tokio-rs#2748 where literals for fields names like `info!("foo" = 2)` could not be used outside the `event!` macro. Fixes tokio-rs#2837 Fixes tokio-rs#2738 ## Solution Previsously, `level!($(args:tt))` was forwarded to `event!(target: ..., level: ..., { $(args:tt) })` but the added curly braces seem to have prevented the `event` macro from correctly understanding the arguments and it tried to pass them to `format!`. With this change there may have some performance impact when expanding the macros in most cases where the braces could have been added as it will take one more step. These are the two relevant `event!` blocks I believe, the new tests used to expand to the first one (with empty fields), now they expand to the latter: ``` (target: $target:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => ( $crate::event!( target: $target, $lvl, { message = $crate::__macro_support::format_args!($($arg)+), $($fields)* } ) ); (target: $target:expr, $lvl:expr, $($arg:tt)+ ) => ( $crate::event!(target: $target, $lvl, { $($arg)+ }) ); ```
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Fixes: #2460
I only fixed lints making #2917 fail. Seems like they affect
v0.1.xbranch as well?