//!
//! This usually involves resolving names, collecting generic arguments etc.
use std::{
- cell::{Cell, RefCell},
+ cell::{Cell, RefCell, RefMut},
iter,
sync::Arc,
};
}
}
TypeRef::Macro(macro_call) => {
- let (expander, recursion_start) = {
- let mut expander = self.expander.borrow_mut();
- if expander.is_some() {
- (Some(expander), false)
- } else {
- *expander = Some(Expander::new(
- self.db.upcast(),
- macro_call.file_id,
- self.resolver.module(),
- ));
- (Some(expander), true)
+ let (mut expander, recursion_start) = {
+ match RefMut::filter_map(self.expander.borrow_mut(), Option::as_mut) {
+ Ok(expander) => (expander, false),
+ Err(expander) => (
+ RefMut::map(expander, |it| {
+ it.insert(Expander::new(
+ self.db.upcast(),
+ macro_call.file_id,
+ self.resolver.module(),
+ ))
+ }),
+ true,
+ ),
}
};
- let ty = if let Some(mut expander) = expander {
- let expander_mut = expander.as_mut().unwrap();
+ let ty = {
let macro_call = macro_call.to_node(self.db.upcast());
- match expander_mut.enter_expand::<ast::Type>(self.db.upcast(), macro_call) {
+ match expander.enter_expand::<ast::Type>(self.db.upcast(), macro_call) {
Ok(ExpandResult { value: Some((mark, expanded)), .. }) => {
- let ctx =
- LowerCtx::new(self.db.upcast(), expander_mut.current_file_id());
+ let ctx = LowerCtx::new(self.db.upcast(), expander.current_file_id());
let type_ref = TypeRef::from_ast(&ctx, expanded);
drop(expander);
}
_ => None,
}
- } else {
- None
};
if recursion_start {
*self.expander.borrow_mut() = None;
TyKind::Placeholder(to_placeholder_idx(self.db, param_id.into()))
}
ParamLoweringMode::Variable => {
- let idx = generics.param_idx(param_id.into()).expect("matching generics");
+ let idx = match generics.param_idx(param_id.into()) {
+ None => {
+ never!("no matching generics");
+ return (TyKind::Error.intern(Interner), None);
+ }
+ Some(idx) => idx,
+ };
+
TyKind::BoundVar(BoundVar::new(self.in_binders, idx))
}
}