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authorbors[bot] <26634292+bors[bot]@users.noreply.github.com>2021-03-15 18:24:22 +0000
committerGitHub <[email protected]>2021-03-15 18:24:22 +0000
commit47b74cadf9774f624ff13f8c7929c66be8247fc8 (patch)
tree6dc42e70ef3635bb53354b4e8991f517eb9b389d /crates/hir_ty/src/traits/chalk
parente24453c5ee46546b0852c15500d51f77b10a7a6f (diff)
parentebb10da563f1c3a0ebf48c1022bceb9641b6e964 (diff)
Merge #7970
7970: Fix incorrect diagnostics for failing built in macros r=jonas-schievink a=brandondong **Reproduction:** 1. Use a built in macro in such a way that rust-analyzer fails to expand it. For example: **lib.rs** ``` include!("<valid file but without a .rs extension so it is not indexed by rust-analyzer>"); ``` 2. rust-analyzer highlights the macro call and says the macro itself cannot be resolved even though include! is in the standard library (unresolved-macro-call diagnostic). 3. No macro-error diagnostic is raised. **Root cause for incorrect unresolved-macro-call diagnostic:** 1. collector:collect_macro_call is able to resolve include! in legacy scope but the expansion fails. Therefore, it's pushed into unexpanded_macros to be retried with module scope. 2. include! fails at the resolution step in collector:resolve_macros now that it's using module scope. Therefore, it's retained in unexpanded_macros. 3. Finally, collector:finish tries resolving the remaining unexpanded macros but only with module scope. include! again fails at the resolution step so a diagnostic is created. **Root cause for missing macro-error diagnostic:** 1. In collector:resolve_macros, directive.legacy is None since eager expansion failed in collector:collect_macro_call. The macro_call_as_call_id fails to resolve since we're retrying in module scope. Therefore, collect_macro_expansion is not called for the macro and no macro-error diagnostic is generated. **Fix:** - In collector:collect_macro_call, do not add failing built-in macros to the unexpanded_macros list and immediately raise the macro-error diagnostic. This is in contrast to lazy macros which are resolved in collector::resolve_macros and later expanded in collect_macro_expansion where a macro-error diagnostic may be raised. Co-authored-by: Brandon <[email protected]> Co-authored-by: brandondong <[email protected]>
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