Introduce `TyErr` independent from `TyInfer`
Add a `TyErr` type to represent unknown types in places where parse errors have happened, while still able to build the AST. Initially only used to represent incorrectly written fn arguments and avoid "expected X parameters, found Y" errors when called with the appropriate amount of parameters. We cannot use `TyInfer` for this as `_` is not allowed as a valid argument type. Example output: ```rust error: expected one of `:` or `@`, found `,` --> file.rs:12:9 | 12 | fn bar(x, y: usize) {} | ^ error[E0061]: this function takes 2 parameters but 3 parameters were supplied --> file.rs:19:9 | 12 | fn bar(x, y) {} | --------------- defined here ... 19 | bar(1, 2, 3); | ^^^^^^^ expected 2 parameters ```
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src/test/ui/span/issue-34264.rs
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