Fix circular fn_sig queries to correct number of args for methods #130496
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…iaskrgr Rollup of 4 pull requests Successful merges: - rust-lang#130116 (Implement a Method to Seal `DiagInner`'s Suggestions) - rust-lang#130489 (Ensure that `keyword_ident` lint doesn't trigger on `'r#kw` lifetime) - rust-lang#130491 (more crash tests) - rust-lang#130496 (Fix circular fn_sig queries to correct number of args for methods) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#130496 - jder:issue-130400, r=compiler-errors Fix circular fn_sig queries to correct number of args for methods Fixes rust-lang#130400. This was a [debug assert](https://github.com/rust-lang/rust/blob/28e8f01c2a2f33fb4214925a704e3223b372cad5/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs#L2557) added to some argument error reporting code in rust-lang#129320 which verified that the number of params (from the HIR) matched the `matched_inputs` which ultimately come from ty::FnSig. In the reduced test case: ``` fn foo(&mut self) -> _ { foo() } ``` There is a circular dependency computing the ty::FnSig -- when trying to compute it, we try to figure out the return value, which again depends on this ty::FnSig. In rust-lang#105162, this was supported by short-circuiting the cycle by synthesizing a FnSig with error types for parameters. The [code in question](https://github.com/rust-lang/rust/pull/105162/files#diff-a65feec6bfffb19fbdc60a80becd1030c82a56c16b177182cd277478fdb04592R44) computes the number of parameters by taking the number of parameters from the hir::FnDecl and adding 1 if there is an implicit self parameter. I might be missing a subtlety here, but AFAICT the adjustment for implicit self args is unnecessary and results in one too many args. For example, for this non-errorful code: ``` trait Foo { fn bar(&self) {} } ``` The resulting hir::FnDecl and ty::FnSig both have the same number of inputs -- 1. So, this PR removes that adjustment and adds a test for the debug ICE. r? `@compiler-errors`
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Fixes #130400. This was a debug assert added to some argument error reporting code in #129320 which verified that the number of params (from the HIR) matched the
matched_inputswhich ultimately come from ty::FnSig. In the reduced test case:There is a circular dependency computing the ty::FnSig -- when trying to compute it, we try to figure out the return value, which again depends on this ty::FnSig. In #105162, this was supported by short-circuiting the cycle by synthesizing a FnSig with error types for parameters. The code in question computes the number of parameters by taking the number of parameters from the hir::FnDecl and adding 1 if there is an implicit self parameter.
I might be missing a subtlety here, but AFAICT the adjustment for implicit self args is unnecessary and results in one too many args. For example, for this non-errorful code:
The resulting hir::FnDecl and ty::FnSig both have the same number of inputs -- 1. So, this PR removes that adjustment and adds a test for the debug ICE.
r? @compiler-errors