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Adjusted diagnostic output so that if there is no use in a item sequence,

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then we just suggest the first legal position where you could inject a use.

To do this, I added `inject_use_span` field to `ModSpans`, and populate it in
parser (it is the span of the first token found after inner attributes, if any).
Then I rewrote the use-suggestion code to utilize it, and threw out some stuff
that is now unnecessary with this in place. (I think the result is easier to
understand.)

Then I added a test of issue 87613.
This commit is contained in:
Felix S. Klock II
2022-01-20 14:07:54 -05:00
parent b82795244e
commit d37da1e332
13 changed files with 172 additions and 70 deletions
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6
compiler/rustc_ast/src/mut_visit.rs
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@@ -1009,8 +1009,9 @@ pub fn noop_visit_item_kind<T: MutVisitor>(kind: &mut ItemKind, vis: &mut T) {
ItemKind::Mod(unsafety, mod_kind) => {
visit_unsafety(unsafety, vis);
match mod_kind {
ModKind::Loaded(items, _inline, ModSpans { inner_span }) => {
ModKind::Loaded(items, _inline, ModSpans { inner_span, inject_use_span }) => {
vis.visit_span(inner_span);
vis.visit_span(inject_use_span);
items.flat_map_in_place(|item| vis.flat_map_item(item));
}
ModKind::Unloaded => {}
@@ -1112,8 +1113,9 @@ pub fn noop_visit_crate<T: MutVisitor>(krate: &mut Crate, vis: &mut T) {
vis.visit_id(id);
visit_attrs(attrs, vis);
items.flat_map_in_place(|item| vis.flat_map_item(item));
let ModSpans { inner_span } = spans;
let ModSpans { inner_span, inject_use_span } = spans;
vis.visit_span(inner_span);
vis.visit_span(inject_use_span);
}
// Mutates one item into possibly many items.