Fix E0433 No Typo Suggestions Fixes rust-lang#48676 Fixes rust-lang#87791 Fixes rust-lang#96625 Fixes rust-lang#95462 Fixes rust-lang#101637 Follows up PR rust-lang#72923 Several open issues refer to the problem that E0433 does not suggest typos like other errors normally do. This fix augments the implementation of PR rust-lang#72923. **Background** When the path of a function call, e.g. `Struct::foo()`, involves names that cannot be resolved, there are two errors that could be emitted by the compiler: - If `Struct` is not found, it is ``E0433: failed to resolve: use of undeclared type `Struct` ``. - If `foo` is not found in `Struct`, it is ``E0599: no function or associated item named `foo` found for struct `Struct` in the current scope`` When a name is used as a type, `e.g. fn foo() -> Struct`, and the name cannot be resolved, it is ``E0412: cannot find type `Struct` in this scope``. Before rust-lang#72923, `E0433` does not implement any suggestions, and the PR introduces suggestions for missing `use`s. When a resolution error occurs in the path of a function call, it tries to smart resolve just the type part of the path, e.g. `module::Struct` of a call to `module::Struct::foo()`. However, along with the suggestions, the smart-resolve function will report `E0412` since it only knows that it is a type that we cannot resolve instead of being a part of the path. So, the original implementation swap out `E0412` errors returned by the smart-resolve function with the real `E0433` error, but keeps the "missing `use`" suggestions to be reported to the programmer. **Issue** The current implementation only reports if there are "missing `use`" suggestions returned by the smart-resolve function; otherwise, it would fall back the normal reporting, which does not emit suggestions. But the smart-resolve function could also produce typo suggestions, which are omitted currently. Also, it seems like that not all info has been swapped out when there are missing suggestions. The error message underlining the name in the snippet still says ``not found in this scope``, which is a `E0412` messages, if there are `use` suggestions, but says the normal `use of undeclared type` otherwise. **Fixes** This fix swaps out all fields in `Diagnostic` returned by the smart-resolve function except for `suggestions` with the current error, and merges the `suggestions` of the returned error and that of the current error together. If there are `use` suggestions, the error is saved to `use_injection` to be reported at the end; otherwise, the error is emitted immediately as `Resolver::report_error` does. Some tests are updated to use the correct underlining error messages, and one additional test for typo suggestion is added to the test suite. r? rust-lang/diagnostics

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