Emit a better diagnostic when function actually has a 'self' parameter #72308
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Fixes rust-lang#66898 When we are unable to resolve a reference to `self`, we current assume that the containing function doesn't have a `self` parameter, and emit an error message accordingly. However, if the reference to `self` was created by a macro invocation, then resolution will correctly fail, due to hygiene. In this case, we don't want to tell the user that the containing fuction doesn't have a 'self' paramter if it actually has one. This PR checks for the precense of a 'self' parameter, and adjusts the error message we emit accordingly. TODO: The exact error message we emit could probably be improved. Should we explicitly mention hygiene?
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matthewjasper
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May 19, 2020
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I haven't been able to think of a better error message. @matthewjasper: Are there any other changes that you'd like me to make? |
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I think that it's fine as is. |
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📌 Commit b684448 has been approved by |
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May 25, 2020
Rollup of 4 pull requests Successful merges: - rust-lang#72153 (exhaustively check `ty::Kind` during structural match checking) - rust-lang#72308 (Emit a better diagnostic when function actually has a 'self' parameter) - rust-lang#72560 (Enable `glacier` command via triagebot) - rust-lang#72567 (Clean up E0608 explanation) Failed merges: r? @ghost
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Fixes #66898
When we are unable to resolve a reference to
self, we current assumethat the containing function doesn't have a
selfparameter, andemit an error message accordingly.
However, if the reference to
selfwas created by a macro invocation,then resolution will correctly fail, due to hygiene. In this case, we
don't want to tell the user that the containing fuction doesn't have a
'self' paramter if it actually has one.
This PR checks for the precense of a 'self' parameter, and adjusts the
error message we emit accordingly.
TODO: The exact error message we emit could probably be improved. Should
we explicitly mention hygiene?