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Auto merge of rust-lang#96863 - SparrowLii:let, r=michaelwoerister
use `hir::Let` in `hir::Guard::IfLet` This PR fixes the FIXME about using `hir::Let` in `hir::Guard::IfLet`
2 parents 10d9ecd + 303dcfb commit 07ae142

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18 files changed

+55
-57
lines changed

18 files changed

+55
-57
lines changed

‎compiler/rustc_ast_lowering/src/expr.rs

Lines changed: 8 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -505,8 +505,14 @@ impl<'hir> LoweringContext<'_, 'hir> {
505505
fn lower_arm(&mut self, arm: &Arm) -> hir::Arm<'hir> {
506506
let pat = self.lower_pat(&arm.pat);
507507
let guard = arm.guard.as_ref().map(|cond| {
508-
if let ExprKind::Let(ref pat, ref scrutinee, _) = cond.kind {
509-
hir::Guard::IfLet(self.lower_pat(pat), self.lower_expr(scrutinee))
508+
if let ExprKind::Let(ref pat, ref scrutinee, span) = cond.kind {
509+
hir::Guard::IfLet(self.arena.alloc(hir::Let {
510+
hir_id: self.next_id(),
511+
span: self.lower_span(span),
512+
pat: self.lower_pat(pat),
513+
ty: None,
514+
init: self.lower_expr(scrutinee),
515+
}))
510516
} else {
511517
hir::Guard::If(self.lower_expr(cond))
512518
}

‎compiler/rustc_hir/src/hir.rs

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1320,8 +1320,7 @@ pub struct Let<'hir> {
13201320
#[derive(Debug, HashStable_Generic)]
13211321
pub enum Guard<'hir> {
13221322
If(&'hir Expr<'hir>),
1323-
// FIXME use hir::Let for this.
1324-
IfLet(&'hir Pat<'hir>, &'hir Expr<'hir>),
1323+
IfLet(&'hir Let<'hir>),
13251324
}
13261325

13271326
#[derive(Debug, HashStable_Generic)]

‎compiler/rustc_hir/src/intravisit.rs

Lines changed: 2 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1225,9 +1225,8 @@ pub fn walk_arm<'v, V: Visitor<'v>>(visitor: &mut V, arm: &'v Arm<'v>) {
12251225
if let Some(ref g) = arm.guard {
12261226
match g {
12271227
Guard::If(ref e) => visitor.visit_expr(e),
1228-
Guard::IfLet(ref pat, ref e) => {
1229-
visitor.visit_pat(pat);
1230-
visitor.visit_expr(e);
1228+
Guard::IfLet(ref l) => {
1229+
visitor.visit_let_expr(l);
12311230
}
12321231
}
12331232
}

‎compiler/rustc_hir_pretty/src/lib.rs

Lines changed: 2 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -1915,14 +1915,9 @@ impl<'a> State<'a> {
19151915
self.print_expr(&e);
19161916
self.space();
19171917
}
1918-
hir::Guard::IfLet(pat, e) => {
1918+
hir::Guard::IfLet(hir::Let { pat, ty, init, .. }) => {
19191919
self.word_nbsp("if");
1920-
self.word_nbsp("let");
1921-
self.print_pat(&pat);
1922-
self.space();
1923-
self.word_space("=");
1924-
self.print_expr(&e);
1925-
self.space();
1920+
self.print_let(pat, *ty, init);
19261921
}
19271922
}
19281923
}

‎compiler/rustc_mir_build/src/thir/cx/expr.rs

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -798,8 +798,8 @@ impl<'tcx> Cx<'tcx> {
798798
pattern: self.pattern_from_hir(&arm.pat),
799799
guard: arm.guard.as_ref().map(|g| match g {
800800
hir::Guard::If(ref e) => Guard::If(self.mirror_expr(e)),
801-
hir::Guard::IfLet(ref pat, ref e) => {
802-
Guard::IfLet(self.pattern_from_hir(pat), self.mirror_expr(e))
801+
hir::Guard::IfLet(ref l) => {
802+
Guard::IfLet(self.pattern_from_hir(l.pat), self.mirror_expr(l.init))
803803
}
804804
}),
805805
body: self.mirror_expr(arm.body),

‎compiler/rustc_mir_build/src/thir/pattern/check_match.rs

Lines changed: 6 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -173,10 +173,10 @@ impl<'p, 'tcx> MatchVisitor<'_, 'p, 'tcx> {
173173
for arm in hir_arms {
174174
// Check the arm for some things unrelated to exhaustiveness.
175175
self.check_patterns(&arm.pat, Refutable);
176-
if let Some(hir::Guard::IfLet(ref pat, _)) = arm.guard {
177-
self.check_patterns(pat, Refutable);
178-
let tpat = self.lower_pattern(&mut cx, pat, &mut false);
179-
self.check_let_reachability(&mut cx, pat.hir_id, tpat, tpat.span());
176+
if let Some(hir::Guard::IfLet(ref let_expr)) = arm.guard {
177+
self.check_patterns(let_expr.pat, Refutable);
178+
let tpat = self.lower_pattern(&mut cx, let_expr.pat, &mut false);
179+
self.check_let_reachability(&mut cx, let_expr.pat.hir_id, tpat, tpat.span());
180180
}
181181
}
182182

@@ -1108,9 +1108,9 @@ fn let_source_parent(tcx: TyCtxt<'_>, parent: HirId, pat_id: Option<HirId>) -> L
11081108

11091109
match parent_node {
11101110
hir::Node::Arm(hir::Arm {
1111-
guard: Some(hir::Guard::IfLet(&hir::Pat { hir_id, .. }, _)),
1111+
guard: Some(hir::Guard::IfLet(&hir::Let { pat: hir::Pat { hir_id, .. }, .. })),
11121112
..
1113-
}) if Some(hir_id) == pat_id => {
1113+
}) if Some(*hir_id) == pat_id => {
11141114
return LetSource::IfLetGuard;
11151115
}
11161116
hir::Node::Expr(hir::Expr { kind: hir::ExprKind::Let(..), span, .. }) => {

‎compiler/rustc_passes/src/liveness.rs

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -373,8 +373,8 @@ impl<'tcx> Visitor<'tcx> for IrMaps<'tcx> {
373373

374374
fn visit_arm(&mut self, arm: &'tcx hir::Arm<'tcx>) {
375375
self.add_from_pat(&arm.pat);
376-
if let Some(hir::Guard::IfLet(ref pat, _)) = arm.guard {
377-
self.add_from_pat(pat);
376+
if let Some(hir::Guard::IfLet(ref let_expr)) = arm.guard {
377+
self.add_from_pat(let_expr.pat);
378378
}
379379
intravisit::walk_arm(self, arm);
380380
}
@@ -914,9 +914,9 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
914914

915915
let guard_succ = arm.guard.as_ref().map_or(body_succ, |g| match g {
916916
hir::Guard::If(e) => self.propagate_through_expr(e, body_succ),
917-
hir::Guard::IfLet(pat, e) => {
918-
let let_bind = self.define_bindings_in_pat(pat, body_succ);
919-
self.propagate_through_expr(e, let_bind)
917+
hir::Guard::IfLet(let_expr) => {
918+
let let_bind = self.define_bindings_in_pat(let_expr.pat, body_succ);
919+
self.propagate_through_expr(let_expr.init, let_bind)
920920
}
921921
});
922922
let arm_succ = self.define_bindings_in_pat(&arm.pat, guard_succ);

‎compiler/rustc_typeck/src/check/_match.rs

Lines changed: 2 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -82,13 +82,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
8282
hir::Guard::If(e) => {
8383
self.check_expr_has_type_or_error(e, tcx.types.bool, |_| {});
8484
}
85-
hir::Guard::IfLet(pat, e) => {
86-
let scrutinee_ty = self.demand_scrutinee_type(
87-
e,
88-
pat.contains_explicit_ref_binding(),
89-
false,
90-
);
91-
self.check_pat_top(&pat, scrutinee_ty, None, true);
85+
hir::Guard::IfLet(l) => {
86+
self.check_expr_let(l);
9287
}
9388
};
9489
}

‎compiler/rustc_typeck/src/check/expr.rs

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1105,7 +1105,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
11051105
}
11061106
}
11071107

1108-
fn check_expr_let(&self, let_expr: &'tcx hir::Let<'tcx>) -> Ty<'tcx> {
1108+
pub(super) fn check_expr_let(&self, let_expr: &'tcx hir::Let<'tcx>) -> Ty<'tcx> {
11091109
// for let statements, this is done in check_stmt
11101110
let init = let_expr.init;
11111111
self.warn_if_unreachable(init.hir_id, init.span, "block in `let` expression");

‎compiler/rustc_typeck/src/check/generator_interior.rs

Lines changed: 2 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -298,9 +298,8 @@ impl<'a, 'tcx> Visitor<'tcx> for InteriorVisitor<'a, 'tcx> {
298298
Guard::If(ref e) => {
299299
self.visit_expr(e);
300300
}
301-
Guard::IfLet(ref pat, ref e) => {
302-
self.visit_pat(pat);
303-
self.visit_expr(e);
301+
Guard::IfLet(ref l) => {
302+
self.visit_let_expr(l);
304303
}
305304
}
306305

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