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add support for cfg feature attributes on expression #4063

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Signed-off-by: Benjamin Coenen <5719034+bnjjj@users.noreply.github.com>
This commit is contained in:
Benjamin Coenen 2020-04-25 15:48:04 +02:00
parent 05981823ba
commit b87b335e68
2 changed files with 36 additions and 0 deletions
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4
crates/ra_hir_def/src/body/lower.rs
View file

@ -141,6 +141,10 @@ impl ExprCollector<'_> {
fn collect_expr(&mut self, expr: ast::Expr) -> ExprId {
let syntax_ptr = AstPtr::new(&expr);
let attrs = self.expander.parse_attrs(&expr);
if !self.expander.is_cfg_enabled(&attrs) {
return self.missing_expr();
}
match expr {
ast::Expr::IfExpr(e) => {
let then_branch = self.collect_block_opt(e.then_branch());

32
crates/ra_hir_ty/src/tests.rs
View file

@ -390,6 +390,38 @@ fn no_such_field_with_feature_flag_diagnostics_on_struct_lit() {
assert_snapshot!(diagnostics, @r###""###);
}
#[test]
fn no_such_field_with_feature_flag_diagnostics_on_block_expr() {
let diagnostics = TestDB::with_files(
r#"
//- /lib.rs crate:foo cfg:feature=foo
struct S {
#[cfg(feature = "foo")]
foo: u32,
#[cfg(not(feature = "foo"))]
bar: u32,
}
impl S {
fn new(bar: u32) -> Self {
#[cfg(feature = "foo")]
{
Self { foo: bar }
}
#[cfg(not(feature = "foo"))]
{
Self { bar }
}
}
}
"#,
)
.diagnostics()
.0;
assert_snapshot!(diagnostics, @r###""###);
}
#[test]
fn no_such_field_with_feature_flag_diagnostics_on_struct_fields() {
let diagnostics = TestDB::with_files(