bjoernager/rust
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Replace Vec by Option.

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This commit is contained in:
Camille GILLOT 2021-04-01 19:42:27 +02:00
parent 1baac86670
commit fed4410def
2 changed files with 14 additions and 35 deletions
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32
compiler/rustc_ast_lowering/src/expr.rs
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@ -1186,9 +1186,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
}
}
None => self
.loop_scopes
.last()
.cloned()
.loop_scope
.map(|id| Ok(self.lower_node_id(id)))
.unwrap_or(Err(hir::LoopIdError::OutsideLoopScope)),
};
@ -1208,18 +1206,9 @@ impl<'hir> LoweringContext<'_, 'hir> {
}
fn with_catch_scope<T>(&mut self, catch_id: NodeId, f: impl FnOnce(&mut Self) -> T) -> T {
let len = self.catch_scopes.len();
self.catch_scopes.push(catch_id);
let old_scope = self.catch_scope.replace(catch_id);
let result = f(self);
assert_eq!(
len + 1,
self.catch_scopes.len(),
"catch scopes should be added and removed in stack order"
);
self.catch_scopes.pop().unwrap();
self.catch_scope = old_scope;
result
}
@ -1228,17 +1217,9 @@ impl<'hir> LoweringContext<'_, 'hir> {
let was_in_loop_condition = self.is_in_loop_condition;
self.is_in_loop_condition = false;
let len = self.loop_scopes.len();
self.loop_scopes.push(loop_id);
let old_scope = self.loop_scope.replace(loop_id);
let result = f(self);
assert_eq!(
len + 1,
self.loop_scopes.len(),
"loop scopes should be added and removed in stack order"
);
self.loop_scopes.pop().unwrap();
self.loop_scope = old_scope;
self.is_in_loop_condition = was_in_loop_condition;
@ -1565,8 +1546,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
unstable_span,
);
let thin_attrs = ThinVec::from(attrs);
let catch_scope = self.catch_scopes.last().copied();
let ret_expr = if let Some(catch_node) = catch_scope {
let ret_expr = if let Some(catch_node) = self.catch_scope {
let target_id = Ok(self.lower_node_id(catch_node));
self.arena.alloc(self.expr(
try_span,