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feat: introduce bidirectional type checking

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This commit is contained in:
Shunsuke Shibayama 2023-09-05 13:57:58 +09:00
parent 5f8d744e47
commit 75b5b68831
13 changed files with 501 additions and 135 deletions
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6
crates/erg_compiler/context/unify.rs
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@ -716,6 +716,7 @@ impl<'c, 'l, 'u, L: Locational> Unifier<'c, 'l, 'u, L> {
// ?T(<: Add(?T))
// ?U(:> {1, 2}, <: Add(?U)) ==> {1, 2}
sup_fv.dummy_link();
sub_fv.dummy_link();
if lsub.qual_name() == rsub.qual_name() {
for (lps, rps) in lsub.typarams().iter().zip(rsub.typarams().iter()) {
self.sub_unify_tp(lps, rps, None, false).map_err(|errs| {
@ -735,6 +736,7 @@ impl<'c, 'l, 'u, L: Locational> Unifier<'c, 'l, 'u, L> {
}
}
sup_fv.undo();
sub_fv.undo();
let intersec = self.ctx.intersection(&lsup, &rsup);
if intersec == Type::Never {
return Err(TyCheckErrors::from(TyCheckError::subtyping_error(
@ -765,7 +767,9 @@ impl<'c, 'l, 'u, L: Locational> Unifier<'c, 'l, 'u, L> {
}
// e.g. intersec == Int, rsup == Add(?T)
// => ?T(:> Int)
self.sub_unify(&intersec, &rsup)?;
if !(intersec.is_recursive() && rsup.is_recursive()) {
self.sub_unify(&intersec, &rsup)?;
}
self.sub_unify(&rsub, &union)?;
// self.sub_unify(&intersec, &lsup, loc, param_name)?;
// self.sub_unify(&lsub, &union, loc, param_name)?;