85d44cad45
This fixes an issue where the following code sample would fail to infer
the type contained in the option:
```rust
fn main() {
let mut end = None; // TODO: Fix inference for this in RA
loop {
end = Some(true);
}
}
```
59 lines
2.3 KiB
Rust
59 lines
2.3 KiB
Rust
//! Helper functions for binary operator type inference.
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use hir_def::expr::{ArithOp, BinaryOp, CmpOp};
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use super::{InferTy, Ty, TypeCtor};
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use crate::ApplicationTy;
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pub(super) fn binary_op_return_ty(op: BinaryOp, lhs_ty: Ty, rhs_ty: Ty) -> Ty {
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match op {
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BinaryOp::LogicOp(_) | BinaryOp::CmpOp(_) => Ty::simple(TypeCtor::Bool),
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BinaryOp::Assignment { .. } => Ty::unit(),
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BinaryOp::ArithOp(ArithOp::Shl) | BinaryOp::ArithOp(ArithOp::Shr) => match lhs_ty {
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Ty::Apply(ApplicationTy { ctor, .. }) => match ctor {
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TypeCtor::Int(..) | TypeCtor::Float(..) => lhs_ty,
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_ => Ty::Unknown,
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},
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Ty::Infer(InferTy::IntVar(..)) | Ty::Infer(InferTy::FloatVar(..)) => lhs_ty,
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_ => Ty::Unknown,
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},
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BinaryOp::ArithOp(_) => match rhs_ty {
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Ty::Apply(ApplicationTy { ctor, .. }) => match ctor {
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TypeCtor::Int(..) | TypeCtor::Float(..) => rhs_ty,
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_ => Ty::Unknown,
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},
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Ty::Infer(InferTy::IntVar(..)) | Ty::Infer(InferTy::FloatVar(..)) => rhs_ty,
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_ => Ty::Unknown,
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},
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}
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}
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pub(super) fn binary_op_rhs_expectation(op: BinaryOp, lhs_ty: Ty) -> Ty {
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match op {
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BinaryOp::LogicOp(..) => Ty::simple(TypeCtor::Bool),
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BinaryOp::Assignment { op: None } => lhs_ty,
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BinaryOp::CmpOp(CmpOp::Eq { .. }) => match lhs_ty {
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Ty::Apply(ApplicationTy { ctor, .. }) => match ctor {
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TypeCtor::Int(..)
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| TypeCtor::Float(..)
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| TypeCtor::Str
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| TypeCtor::Char
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| TypeCtor::Bool => lhs_ty,
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_ => Ty::Unknown,
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},
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Ty::Infer(InferTy::IntVar(..)) | Ty::Infer(InferTy::FloatVar(..)) => lhs_ty,
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_ => Ty::Unknown,
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},
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BinaryOp::ArithOp(ArithOp::Shl) | BinaryOp::ArithOp(ArithOp::Shr) => Ty::Unknown,
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BinaryOp::CmpOp(CmpOp::Ord { .. })
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| BinaryOp::Assignment { op: Some(_) }
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| BinaryOp::ArithOp(_) => match lhs_ty {
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Ty::Apply(ApplicationTy { ctor, .. }) => match ctor {
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TypeCtor::Int(..) | TypeCtor::Float(..) => lhs_ty,
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_ => Ty::Unknown,
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},
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Ty::Infer(InferTy::IntVar(..)) | Ty::Infer(InferTy::FloatVar(..)) => lhs_ty,
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_ => Ty::Unknown,
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},
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}
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}
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