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Delay add "is open" constraint until we know a type variable

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This commit is contained in:
Ayaz Hafiz 2022-04-20 15:40:50 -04:00
parent 7b2b41869f
commit 504c3f9b49
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GPG key ID: 0E2A37416A25EF58
4 changed files with 54 additions and 8 deletions
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8
compiler/constrain/src/pattern.rs
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@ -18,6 +18,7 @@ pub struct PatternState {
pub headers: SendMap<Symbol, Loc<Type>>,
pub vars: Vec<Variable>,
pub constraints: Vec<Constraint>,
pub delayed_is_open_constriants: Vec<Constraint>,
}
/// If there is a type annotation, the pattern state headers can be optimized by putting the
@ -180,7 +181,7 @@ pub fn constrain_pattern(
// so, we know that "x" (in this case, a tag union) must be open.
if could_be_a_tag_union(expected.get_type_ref()) {
state
.constraints
.delayed_is_open_constriants
.push(constraints.is_open_type(expected.get_type()));
}
}
@ -191,7 +192,7 @@ pub fn constrain_pattern(
Identifier(symbol) | Shadowed(_, _, symbol) => {
if could_be_a_tag_union(expected.get_type_ref()) {
state
.constraints
.delayed_is_open_constriants
.push(constraints.is_open_type(expected.get_type_ref().clone()));
}
@ -494,6 +495,9 @@ pub fn constrain_pattern(
state.vars.push(*ext_var);
state.constraints.push(whole_con);
state.constraints.push(tag_con);
state
.constraints
.extend(state.delayed_is_open_constriants.drain(..));
}
UnwrappedOpaque {