bjoernager/rust
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Better error if the user tries to do assignment ... else

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This commit is contained in:
est31 2022-02-21 08:27:24 +01:00
parent c1aa85475c
commit 76ea566677
3 changed files with 45 additions and 0 deletions
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10
compiler/rustc_parse/src/parser/stmt.rs
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@ -103,6 +103,16 @@ impl<'a> Parser<'a> {
} else {
self.parse_expr_res(Restrictions::STMT_EXPR, Some(attrs))
}?;
if matches!(e.kind, ExprKind::Assign(..)) && self.eat_keyword(kw::Else) {
let bl = self.parse_block()?;
// Destructuring assignment ... else.
// This is not allowed, but point it out in a nice way.
let mut err = self.struct_span_err(
e.span.to(bl.span),
"<assignment> ... else { ... } is not allowed",
);
err.emit();
}
self.mk_stmt(lo.to(e.span), StmtKind::Expr(e))
} else {
self.error_outer_attrs(&attrs.take_for_recovery());