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Aaron Hill
b541d3da5d
Currently, the `Debug` impl for `proc_macro::Span` just prints out the byte range. This can make debugging proc macros (either as a crate author or as a compiler developer) very frustrating, since neither the actual filename nor the `SyntaxContext` is displayed. This commit adds a perma-unstable flag `-Z span-debug`. When enabled, the `Debug` impl for `proc_macro::Span` simply forwards directly to `rustc_span::Span`. Once #72618 is merged, this will start displaying actual line numbers. While `Debug` impls are not subject to Rust's normal stability guarnatees, we probably shouldn't expose any additional information on stable until `#![feature(proc_macro_span)]` is stabilized. Otherwise, we would be providing a 'backdoor' way to access information that's supposed be behind unstable APIs.
42 lines
587 B
Rust
42 lines
587 B
Rust
// run-pass
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// aux-build:macro-dump-debug.rs
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// compile-flags: -Z span-debug
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extern crate macro_dump_debug;
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use macro_dump_debug::dump_debug;
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dump_debug! {
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ident // ident
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r#ident // raw ident
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, // alone punct
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==> // joint punct
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() // empty group
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[_] // nonempty group
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// unsuffixed literals
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0
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1.0
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"S"
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b"B"
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r"R"
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r##"R"##
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br"BR"
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br##"BR"##
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'C'
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b'B'
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// suffixed literals
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0q
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1.0q
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"S"q
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b"B"q
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r"R"q
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r##"R"##q
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br"BR"q
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br##"BR"##q
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'C'q
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b'B'q
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}
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fn main() {}
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