Allow Clippy to define duplicate extra symbols #143596
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Fixes #142410 (comment)
rustc_macros::symbolsnow also expands to a macroextra_symbolsthat callsrustc_macros::extra_symbols_implwith the prefill stream so that it can know which symbols are duplicatedextra_symbolsallows supplying a name to define a macro to provide even more extra symbols, this is useful for external drivers that rely onclippy_utilse.g. TheBevyFlock/bevy_cli#456There's a usage example in
compiler/rustc_span/src/symbol/tests.rsDUPLICATE_SYMBOLSis currently unused, but we can use it on the clippy side to remove duplicates without interfering withr-l/rustPRs