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Lay the foundation for diagnostics in ty lowering, and implement a first diagnostic

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The diagnostic implemented is a simple one (E0109). It serves as a test for the new foundation.

This commit only implements diagnostics for type in bodies and body-carrying signatures; the next commit will include diagnostics in the rest of the things.

Also fix one weird bug that was detected when implementing this that caused `Fn::(A, B) -> C` (which is a valid, if bizarre, alternative syntax to `Fn(A, B) -> C` to lower incorrectly.

And also fix a maybe-bug where parentheses were sneaked into a code string needlessly; this was not detected until now because the parentheses were removed (by the make-AST family API), but with a change in this commit they are now inserted. So fix that too.
This commit is contained in:
Chayim Refael Friedman 2024-11-20 23:05:48 +02:00
parent 4e475a3245
commit 5f25ae3d1b
19 changed files with 811 additions and 80 deletions
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2
crates/syntax/src/ast/make.rs
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@ -402,7 +402,7 @@ pub fn join_paths(paths: impl IntoIterator<Item = ast::Path>) -> ast::Path {
// FIXME: should not be pub
pub fn path_from_text(text: &str) -> ast::Path {
ast_from_text(&format!("fn main() {{ let test = {text}; }}"))
ast_from_text(&format!("fn main() {{ let test: {text}; }}"))
}
pub fn use_tree_glob() -> ast::UseTree {