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Implement match binding type inference and arm unification

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This commit is contained in:
Marcus Klaas de Vries 2019-01-17 00:29:26 +01:00 committed by Aleksey Kladov
parent ac216880f5
commit 06d16a18f6
2 changed files with 25 additions and 8 deletions
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24
crates/ra_hir/src/ty.rs
View File

@ -36,7 +36,7 @@ use crate::{
db::HirDatabase,
type_ref::{TypeRef, Mutability},
name::KnownName,
expr::{Body, Expr, Literal, ExprId, Pat, PatId, UnaryOp, BinaryOp, Statement, FieldPat},
expr::{Body, Expr, MatchArm, Literal, ExprId, Pat, PatId, UnaryOp, BinaryOp, Statement, FieldPat},
};
/// The ID of a type variable.
@ -1097,14 +1097,24 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
ret_ty
}
Expr::Match { expr, arms } => {
let _ty = self.infer_expr(*expr, &Expectation::none());
for arm in arms {
// TODO type the bindings in pats
let mut expected = Expectation::none();
let input_ty = self.infer_expr(*expr, &Expectation::none());
let pat_expectation = Expectation::has_type(input_ty);
for MatchArm {
pats,
expr: arm_expr,
} in arms
{
for &pat in pats {
let _pat_ty = self.infer_pat(pat, &pat_expectation);
}
// TODO type the guard
let _ty = self.infer_expr(arm.expr, &Expectation::none());
let ty = self.infer_expr(*arm_expr, &expected);
expected = Expectation::has_type(ty);
}
// TODO unify all the match arm types
Ty::Unknown
expected.ty
}
Expr::Path(p) => self.infer_path_expr(expr, p).unwrap_or(Ty::Unknown),
Expr::Continue => Ty::Never,

9
crates/ra_hir/src/ty/tests/data/adt_pattern.txt
View File

@ -1,4 +1,4 @@
[68; 155) '{ ...= e; }': ()
[68; 221) '{ ... }; }': ()
[78; 79) 'e': E
[82; 95) 'E::A { x: 3 }': E
[92; 93) '3': usize
@ -9,3 +9,10 @@
[129; 148) 'E::A {..._var }': E
[139; 146) 'new_var': usize
[151; 152) 'e': E
[159; 218) 'match ... }': usize
[165; 166) 'e': E
[177; 187) 'E::A { x }': E
[184; 185) 'x': usize
[191; 192) 'x': usize
[202; 206) 'E::B': E
[210; 211) '1': usize