bjoernager/rust
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rescope temp lifetime in let-chain into IfElse

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apply rules by span edition
This commit is contained in:
Ding Xiang Fei 2023-01-24 16:06:35 +08:00
parent 33855f80d4
commit f93df1f7dc
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GPG key ID: 3CD748647EEF6359
30 changed files with 1102 additions and 35 deletions
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10
compiler/rustc_mir_build/src/build/expr/as_temp.rs
View file

@ -1,7 +1,9 @@
//! See docs in build/expr/mod.rs
use rustc_data_structures::stack::ensure_sufficient_stack;
use rustc_hir::HirId;
use rustc_middle::middle::region;
use rustc_middle::middle::region::{Scope, ScopeData};
use rustc_middle::mir::*;
use rustc_middle::thir::*;
use tracing::{debug, instrument};
@ -73,11 +75,19 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
_ if let Some(tail_info) = this.block_context.currently_in_block_tail() => {
LocalInfo::BlockTailTemp(tail_info)
}
_ if let Some(Scope { data: ScopeData::IfThenRescope, id }) = temp_lifetime => {
LocalInfo::IfThenRescopeTemp {
if_then: HirId { owner: this.hir_id.owner, local_id: id },
}
}
_ => LocalInfo::Boring,
};
**local_decl.local_info.as_mut().assert_crate_local() = local_info;
this.local_decls.push(local_decl)
};
debug!(?temp);
if deduplicate_temps {
this.fixed_temps.insert(expr_id, temp);
}

8
compiler/rustc_mir_build/src/thir/cx/expr.rs
View file

@ -706,7 +706,13 @@ impl<'tcx> Cx<'tcx> {
hir::ExprKind::If(cond, then, else_opt) => ExprKind::If {
if_then_scope: region::Scope {
id: then.hir_id.local_id,
data: region::ScopeData::IfThen,
data: {
if expr.span.at_least_rust_2024() && tcx.features().if_let_rescope {
region::ScopeData::IfThenRescope
} else {
region::ScopeData::IfThen
}
},
},
cond: self.mirror_expr(cond),
then: self.mirror_expr(then),