6bf486711b
fix the false 'defined here' messages Closes #80853. Take this code: ```rust struct S; fn repro_ref(thing: S) { thing(); } ``` Previously, the error message would be this: ``` error[E0618]: expected function, found `S` --> src/lib.rs:4:5 | 3 | fn repro_ref(thing: S) { | ----- `S` defined here 4 | thing(); | ^^^^^-- | | | call expression requires function error: aborting due to previous error ``` This is incorrect as `S` is not defined in the function arguments, `thing` is defined there. With this change, the following is emitted: ``` error[E0618]: expected function, found `S` --> $DIR/80853.rs:4:5 | LL | fn repro_ref(thing: S) { | ----- is of type `S` LL | thing(); | ^^^^^-- | | | call expression requires function | = note: local variable `S` is not a function error: aborting due to previous error ``` As you can see, this error message points out that `thing` is of type `S` and later in a note, that `S` is not a function. This change does seem like a downside for some error messages. Take this example: ``` LL | struct Empty2; | -------------- is of type `Empty2` ``` As you can see, the error message shows that the definition of `Empty2` is of type `Empty2`. Although this isn't wrong, it would be more helpful if it would say something like this (which was there previously): ``` LL | struct Empty2; | -------------- `Empty2` defined here ``` If there is a better way of doing this, where the `Empty2` example would stay the same as without this change, please inform me. **Update: This is now fixed** CC `@camelid` |
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For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.