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Add `Expr::Underscore`
| -rw-r--r-- | crates/hir-def/src/body/lower.rs | 2 | ||||
| -rw-r--r-- | crates/hir-def/src/expr.rs | 2 | ||||
| -rw-r--r-- | crates/hir-ty/src/infer/expr.rs | 6 |
3 files changed, 9 insertions, 1 deletions
diff --git a/crates/hir-def/src/body/lower.rs b/crates/hir-def/src/body/lower.rs index 5d7a1100cd..cf20ad7139 100644 --- a/crates/hir-def/src/body/lower.rs +++ b/crates/hir-def/src/body/lower.rs @@ -536,7 +536,7 @@ impl ExprCollector<'_> { self.alloc_expr(Expr::MacroStmts { tail }, syntax_ptr) } - ast::Expr::UnderscoreExpr(_) => return None, + ast::Expr::UnderscoreExpr(_) => self.alloc_expr(Expr::Underscore, syntax_ptr), }) } diff --git a/crates/hir-def/src/expr.rs b/crates/hir-def/src/expr.rs index bc06085894..49b7ef451e 100644 --- a/crates/hir-def/src/expr.rs +++ b/crates/hir-def/src/expr.rs @@ -203,6 +203,7 @@ pub enum Expr { }, Array(Array), Literal(Literal), + Underscore, } #[derive(Debug, Clone, Eq, PartialEq)] @@ -345,6 +346,7 @@ impl Expr { }, Expr::MacroStmts { tail } => f(*tail), Expr::Literal(_) => {} + Expr::Underscore => {} } } } diff --git a/crates/hir-ty/src/infer/expr.rs b/crates/hir-ty/src/infer/expr.rs index 2e645bf52b..4d4d187fe8 100644 --- a/crates/hir-ty/src/infer/expr.rs +++ b/crates/hir-ty/src/infer/expr.rs @@ -775,6 +775,12 @@ impl<'a> InferenceContext<'a> { }, }, Expr::MacroStmts { tail } => self.infer_expr_inner(*tail, expected), + Expr::Underscore => { + // Underscore expressions may only appear in assignee expressions, + // which are handled by `infer_assignee_expr()`, so any underscore + // expression reaching this branch is an error. + self.err_ty() + } }; // use a new type variable if we got unknown here let ty = self.insert_type_vars_shallow(ty); |