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Set expectation for no-semi expression statements to unit

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This commit is contained in:
Lukas Wirth 2023-03-04 12:48:57 +01:00
parent 73e2505cfa
commit 24ba1bed04
5 changed files with 82 additions and 47 deletions
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4
crates/hir-def/src/resolver.rs
View File

@ -294,8 +294,8 @@ impl Resolver {
}
}
if let res @ Some(_) = self.module_scope.resolve_path_in_value_ns(db, path) {
return res;
if let Some(res) = self.module_scope.resolve_path_in_value_ns(db, path) {
return Some(res);
}
// If a path of the shape `u16::from_le_bytes` failed to resolve at all, then we fall back

43
crates/hir-ty/src/infer/expr.rs
View File

@ -130,7 +130,7 @@ impl<'a> InferenceContext<'a> {
);
let ty = match label {
Some(_) => {
let break_ty = self.table.new_type_var();
let break_ty = expected.coercion_target_type(&mut self.table);
let (breaks, ty) = self.with_breakable_ctx(
BreakableKind::Block,
Some(break_ty.clone()),
@ -403,28 +403,37 @@ impl<'a> InferenceContext<'a> {
Expr::Match { expr, arms } => {
let input_ty = self.infer_expr(*expr, &Expectation::none());
let expected = expected.adjust_for_branches(&mut self.table);
let result_ty = if arms.is_empty() {
if arms.is_empty() {
self.diverges = Diverges::Always;
self.result.standard_types.never.clone()
} else {
expected.coercion_target_type(&mut self.table)
let matchee_diverges = mem::replace(&mut self.diverges, Diverges::Maybe);
let mut all_arms_diverge = Diverges::Always;
for arm in arms.iter() {
let input_ty = self.resolve_ty_shallow(&input_ty);
self.infer_top_pat(arm.pat, &input_ty);
}
let expected = expected.adjust_for_branches(&mut self.table);
let result_ty = match &expected {
// We don't coerce to `()` so that if the match expression is a
// statement it's branches can have any consistent type.
Expectation::HasType(ty) if *ty != self.result.standard_types.unit => {
ty.clone()
}
_ => self.table.new_type_var(),
};
let mut coerce = CoerceMany::new(result_ty);
let matchee_diverges = self.diverges;
let mut all_arms_diverge = Diverges::Always;
for arm in arms.iter() {
self.diverges = Diverges::Maybe;
let input_ty = self.resolve_ty_shallow(&input_ty);
self.infer_top_pat(arm.pat, &input_ty);
if let Some(guard_expr) = arm.guard {
self.diverges = Diverges::Maybe;
self.infer_expr(
guard_expr,
&Expectation::HasType(self.result.standard_types.bool_.clone()),
);
}
self.diverges = Diverges::Maybe;
let arm_ty = self.infer_expr_inner(arm.expr, &expected);
all_arms_diverge &= self.diverges;
@ -435,6 +444,7 @@ impl<'a> InferenceContext<'a> {
coerce.complete(self)
}
}
Expr::Path(p) => {
// FIXME this could be more efficient...
let resolver = resolver_for_expr(self.db.upcast(), self.owner, tgt_expr);
@ -1179,8 +1189,15 @@ impl<'a> InferenceContext<'a> {
self.diverges = previous_diverges;
}
}
Statement::Expr { expr, .. } => {
self.infer_expr(*expr, &Expectation::none());
&Statement::Expr { expr, has_semi } => {
self.infer_expr(
expr,
&if has_semi {
Expectation::none()
} else {
Expectation::HasType(self.result.standard_types.unit.clone())
},
);
}
}
}

23
crates/hir-ty/src/infer/path.rs
View File

@ -40,20 +40,14 @@ impl<'a> InferenceContext<'a> {
id: ExprOrPatId,
) -> Option<Ty> {
let (value, self_subst) = if let Some(type_ref) = path.type_anchor() {
if path.segments().is_empty() {
// This can't actually happen syntax-wise
return None;
}
let Some(last) = path.segments().last() else { return None };
let ty = self.make_ty(type_ref);
let remaining_segments_for_ty = path.segments().take(path.segments().len() - 1);
let ctx = crate::lower::TyLoweringContext::new(self.db, resolver);
let (ty, _) = ctx.lower_ty_relative_path(ty, None, remaining_segments_for_ty);
self.resolve_ty_assoc_item(
ty,
path.segments().last().expect("path had at least one segment").name,
id,
)?
self.resolve_ty_assoc_item(ty, last.name, id)?
} else {
// FIXME: report error, unresolved first path segment
let value_or_partial =
resolver.resolve_path_in_value_ns(self.db.upcast(), path.mod_path())?;
@ -66,10 +60,13 @@ impl<'a> InferenceContext<'a> {
};
let typable: ValueTyDefId = match value {
ValueNs::LocalBinding(pat) => {
let ty = self.result.type_of_pat.get(pat)?.clone();
return Some(ty);
ValueNs::LocalBinding(pat) => match self.result.type_of_pat.get(pat) {
Some(ty) => return Some(ty.clone()),
None => {
never!("uninferred pattern?");
return None;
}
},
ValueNs::FunctionId(it) => it.into(),
ValueNs::ConstId(it) => it.into(),
ValueNs::StaticId(it) => it.into(),
@ -91,7 +88,7 @@ impl<'a> InferenceContext<'a> {
let ty = self.db.value_ty(struct_id.into()).substitute(Interner, &substs);
return Some(ty);
} else {
// FIXME: diagnostic, invalid Self reference
// FIXME: report error, invalid Self reference
return None;
}
}

21
crates/hir-ty/src/tests/diagnostics.rs
View File

@ -73,3 +73,24 @@ fn test(x: bool) -> &'static str {
"#,
);
}
#[test]
fn non_unit_block_expr_stmt_no_semi() {
check(
r#"
fn test(x: bool) {
if x {
"notok"
//^^^^^^^ expected (), got &str
} else {
"ok"
//^^^^ expected (), got &str
}
match x { true => true, false => 0 }
//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected (), got bool
//^ expected bool, got i32
()
}
"#,
);
}

4
crates/hir-ty/src/tests/regression.rs
View File

@ -1015,9 +1015,9 @@ fn cfg_tail() {
20..31 '{ "first" }': ()
22..29 '"first"': &str
72..190 '{ ...] 13 }': ()
78..88 '{ "fake" }': &str
78..88 '{ "fake" }': ()
80..86 '"fake"': &str
93..103 '{ "fake" }': &str
93..103 '{ "fake" }': ()
95..101 '"fake"': &str
108..120 '{ "second" }': ()
110..118 '"second"': &str