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Implement LUB coercion of array elements

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This commit is contained in:
Jonas Schievink 2021-07-07 22:50:20 +02:00
parent f5a100e5fd
commit cb63b021ff
3 changed files with 25 additions and 11 deletions
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6
crates/hir_ty/src/infer/expr.rs
View File

@ -729,7 +729,7 @@ impl<'a> InferenceContext<'a> {
TyKind::Tuple(tys.len(), Substitution::from_iter(&Interner, tys)).intern(&Interner)
}
Expr::Array(array) => {
let elem_ty =
let mut elem_ty =
match expected.to_option(&mut self.table).as_ref().map(|t| t.kind(&Interner)) {
Some(TyKind::Array(st, _) | TyKind::Slice(st)) => st.clone(),
_ => self.table.new_type_var(),
@ -738,8 +738,8 @@ impl<'a> InferenceContext<'a> {
let len = match array {
Array::ElementList(items) => {
for expr in items.iter() {
// FIXME: use CoerceMany (coerce_merge_branch)
self.infer_expr_coerce(*expr, &Expectation::has_type(elem_ty.clone()));
let cur_elem_ty = self.infer_expr_inner(*expr, expected);
elem_ty = self.coerce_merge_branch(Some(*expr), &elem_ty, &cur_elem_ty);
}
Some(items.len() as u64)
}

14
crates/hir_ty/src/tests/coercion.rs
View File

@ -507,3 +507,17 @@ fn main() {
"#,
);
}
#[test]
fn coerce_array_elems_lub() {
check_no_mismatches(
r#"
fn f() {}
fn g() {}
fn test() {
[f, g];
}
"#,
);
}

16
crates/hir_ty/src/tests/regression.rs
View File

@ -117,19 +117,19 @@ fn recursive_vars_2() {
"#,
expect![[r#"
10..79 '{ ...x)]; }': ()
20..21 'x': &{unknown}
24..31 'unknown': &{unknown}
20..21 'x': {unknown}
24..31 'unknown': {unknown}
41..42 'y': {unknown}
45..52 'unknown': {unknown}
58..76 '[(x, y..., &x)]': [(&{unknown}, {unknown}); 2]
59..65 '(x, y)': (&{unknown}, {unknown})
60..61 'x': &{unknown}
58..76 '[(x, y..., &x)]': [({unknown}, {unknown}); 2]
59..65 '(x, y)': ({unknown}, {unknown})
60..61 'x': {unknown}
63..64 'y': {unknown}
67..75 '(&y, &x)': (&{unknown}, {unknown})
67..75 '(&y, &x)': (&{unknown}, &{unknown})
68..70 '&y': &{unknown}
69..70 'y': {unknown}
72..74 '&x': &&{unknown}
73..74 'x': &{unknown}
72..74 '&x': &{unknown}
73..74 'x': {unknown}
"#]],
);
}