[gcc/devel/rust/master] nr2.0: Fix IfLet pattern handling

[Thomas Schwinge]

https://gcc.gnu.org/g:ba32a6e460813a94e5f129dbc0e259c300690385

commit ba32a6e460813a94e5f129dbc0e259c300690385
Author: Owen Avery <powerboat9.gamer@gmail.com>
Date:   Wed May 14 20:03:01 2025 -0400

    nr2.0: Fix IfLet pattern handling
    
    gcc/rust/ChangeLog:
    
            * resolve/rust-default-resolver.cc
            (DefaultResolver::visit_if_let_patterns): New function
            definition.
            (DefaultResolver::visit): New IfLetExpr visitor definition.
            * resolve/rust-default-resolver.h
            (DefaultResolver::visit_if_let_patterns): New function
            declaration.
            (DefaultResolver::visit): New IfLetExpr visitor declaration.
            * resolve/rust-late-name-resolver-2.0.cc (Late::visit): Remove
            IfLetExpr visitor definition.
            (Late::visit_if_let_patterns): New function definition.
            * resolve/rust-late-name-resolver-2.0.h (Late::visit): Remove
            IfLetExpr visitor declaration.
            (Late::visit_if_let_patterns): New function declaration.
            * resolve/rust-name-resolution-context.h (BindingSource::IfLet):
            New enumerator.
    
    Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>

Diff:
---
 gcc/rust/resolve/rust-default-resolver.cc       | 22 ++++++++++++++++++++++
 gcc/rust/resolve/rust-default-resolver.h        |  2 ++
 gcc/rust/resolve/rust-late-name-resolver-2.0.cc | 12 +++---------
 gcc/rust/resolve/rust-late-name-resolver-2.0.h  |  2 +-
 gcc/rust/resolve/rust-name-resolution-context.h |  1 +
 5 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/gcc/rust/resolve/rust-default-resolver.cc b/gcc/rust/resolve/rust-default-resolver.cc
index 7d8029fe3bfd..2dafa8861f61 100644
--- a/gcc/rust/resolve/rust-default-resolver.cc
+++ b/gcc/rust/resolve/rust-default-resolver.cc
@@ -60,6 +60,28 @@ DefaultResolver::visit (AST::ForLoopExpr &expr)
 	      [this, &expr] () { AST::DefaultASTVisitor::visit (expr); });
 }
 
+void
+DefaultResolver::visit_if_let_patterns (AST::IfLetExpr &expr)
+{
+  for (auto &pattern : expr.get_patterns ())
+    visit (pattern);
+}
+
+void
+DefaultResolver::visit (AST::IfLetExpr &expr)
+{
+  auto inner_vis = [this, &expr] () {
+    visit_if_let_patterns (expr);
+    visit (expr.get_if_block ());
+  };
+
+  visit_outer_attrs (expr);
+
+  visit (expr.get_value_expr ());
+
+  ctx.scoped (Rib::Kind::Normal, expr.get_node_id (), inner_vis);
+}
+
 void
 DefaultResolver::visit (AST::Trait &trait)
 {
diff --git a/gcc/rust/resolve/rust-default-resolver.h b/gcc/rust/resolve/rust-default-resolver.h
index 14ada236b7a8..6fa977b26a78 100644
--- a/gcc/rust/resolve/rust-default-resolver.h
+++ b/gcc/rust/resolve/rust-default-resolver.h
@@ -46,6 +46,8 @@ public:
   void visit (AST::Module &) override;
   void visit (AST::Function &) override;
   void visit (AST::ForLoopExpr &expr) override;
+  virtual void visit_if_let_patterns (AST::IfLetExpr &expr);
+  void visit (AST::IfLetExpr &expr) override;
   void visit (AST::Trait &) override;
   // used to handle Self insertion in TopLevel
   virtual void maybe_insert_big_self (AST::Impl &) {}
diff --git a/gcc/rust/resolve/rust-late-name-resolver-2.0.cc b/gcc/rust/resolve/rust-late-name-resolver-2.0.cc
index 4ed5528c9110..da6820e02fff 100644
--- a/gcc/rust/resolve/rust-late-name-resolver-2.0.cc
+++ b/gcc/rust/resolve/rust-late-name-resolver-2.0.cc
@@ -147,19 +147,13 @@ Late::visit (AST::ForLoopExpr &expr)
 }
 
 void
-Late::visit (AST::IfLetExpr &expr)
+Late::visit_if_let_patterns (AST::IfLetExpr &expr)
 {
-  visit_outer_attrs (expr);
+  ctx.bindings.enter (BindingSource::IfLet);
 
-  ctx.bindings.enter (BindingSource::Let);
-
-  for (auto &pattern : expr.get_patterns ())
-    visit (pattern);
+  DefaultResolver::visit_if_let_patterns (expr);
 
   ctx.bindings.exit ();
-
-  visit (expr.get_value_expr ());
-  visit (expr.get_if_block ());
 }
 
 void
diff --git a/gcc/rust/resolve/rust-late-name-resolver-2.0.h b/gcc/rust/resolve/rust-late-name-resolver-2.0.h
index 896b72ce4399..6b777cc76d66 100644
--- a/gcc/rust/resolve/rust-late-name-resolver-2.0.h
+++ b/gcc/rust/resolve/rust-late-name-resolver-2.0.h
@@ -50,7 +50,7 @@ public:
   void visit (AST::SelfParam &) override;
   void visit (AST::MatchArm &) override;
   void visit (AST::ForLoopExpr &) override;
-  void visit (AST::IfLetExpr &) override;
+  void visit_if_let_patterns (AST::IfLetExpr &) override;
 
   // resolutions
   void visit (AST::IdentifierExpr &) override;
diff --git a/gcc/rust/resolve/rust-name-resolution-context.h b/gcc/rust/resolve/rust-name-resolution-context.h
index aab04ccc18eb..6d990fd60760 100644
--- a/gcc/rust/resolve/rust-name-resolution-context.h
+++ b/gcc/rust/resolve/rust-name-resolution-context.h
@@ -177,6 +177,7 @@ enum class BindingSource
 {
   Match,
   Let,
+  IfLet,
   For,
   /* Closure param or function param */
   Param