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Fix Ok(()) suggestion when desugaring is involved.

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This commit is contained in:
Mara Bos 2022-01-19 13:11:26 +01:00
parent c42d846add
commit 003c892f9f
1 changed files with 19 additions and 2 deletions
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21
compiler/rustc_typeck/src/check/demand.rs
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@ -276,11 +276,28 @@ fn suggest_compatible_variants(
// we suggest adding a separate return expression instead.
// (To avoid things like suggesting `Ok(while .. { .. })`.)
if expr_ty.is_unit() {
let mut id = expr.hir_id;
let mut parent;
// Unroll desugaring, to make sure this works for `for` loops etc.
loop {
parent = self.tcx.hir().get_parent_node(id);
if let Some(parent_span) = self.tcx.hir().opt_span(parent) {
if parent_span.find_ancestor_inside(expr.span).is_some() {
// The parent node is part of the same span, so is the result of the
// same expansion/desugaring and not the 'real' parent node.
id = parent;
continue;
}
}
break;
}
if let Some(hir::Node::Block(&hir::Block {
span: block_span, expr: Some(e), ..
})) = self.tcx.hir().find(self.tcx.hir().get_parent_node(expr.hir_id))
})) = self.tcx.hir().find(parent)
{
if e.hir_id == expr.hir_id {
if e.hir_id == id {
if let Some(span) = expr.span.find_ancestor_inside(block_span) {
let return_suggestions =
if self.tcx.is_diagnostic_item(sym::Result, expected_adt.did) {