[gcc/devel/rust/master] Implement name resolution for the IfLet expression.

[gcc/devel/rust/master] Implement name resolution for the IfLet expression.

[Thomas Schwinge]

https://gcc.gnu.org/g:a91b138bbc26408d97bbe870553b4276f8bf1f71

commit a91b138bbc26408d97bbe870553b4276f8bf1f71
Author: antego <antego@users.noreply.github.com>
Date:   Tue May 10 21:48:05 2022 +1000

    Implement name resolution for the IfLet expression.
    
    Addresses #1177.

Diff:
---
 gcc/rust/resolve/rust-ast-resolve-expr.cc | 25 +++++++++++++++++++++++++
 gcc/rust/resolve/rust-ast-resolve-expr.h  |  2 ++
 2 files changed, 27 insertions(+)

diff --git a/gcc/rust/resolve/rust-ast-resolve-expr.cc b/gcc/rust/resolve/rust-ast-resolve-expr.cc
index 71af8c23205..402c0488277 100644
--- a/gcc/rust/resolve/rust-ast-resolve-expr.cc
+++ b/gcc/rust/resolve/rust-ast-resolve-expr.cc
@@ -198,6 +198,31 @@ ResolveExpr::visit (AST::IfExprConseqIf &expr)
   resolve_expr (expr.get_conseq_if_expr ().get (), expr.get_node_id ());
 }
 
+void
+ResolveExpr::visit (AST::IfLetExpr &expr)
+{
+  resolve_expr (expr.get_value_expr ().get (), expr.get_node_id ());
+
+  NodeId scope_node_id = expr.get_node_id ();
+  resolver->get_name_scope ().push (scope_node_id);
+  resolver->get_type_scope ().push (scope_node_id);
+  resolver->get_label_scope ().push (scope_node_id);
+  resolver->push_new_name_rib (resolver->get_name_scope ().peek ());
+  resolver->push_new_type_rib (resolver->get_type_scope ().peek ());
+  resolver->push_new_label_rib (resolver->get_type_scope ().peek ());
+
+  for (auto &pattern : expr.get_patterns ())
+    {
+      PatternDeclaration::go (pattern.get (), expr.get_node_id ());
+    }
+
+  resolve_expr (expr.get_if_block ().get (), expr.get_node_id ());
+
+  resolver->get_name_scope ().pop ();
+  resolver->get_type_scope ().pop ();
+  resolver->get_label_scope ().pop ();
+}
+
 void
 ResolveExpr::visit (AST::BlockExpr &expr)
 {
diff --git a/gcc/rust/resolve/rust-ast-resolve-expr.h b/gcc/rust/resolve/rust-ast-resolve-expr.h
index 34a318d6d04..72e608532fd 100644
--- a/gcc/rust/resolve/rust-ast-resolve-expr.h
+++ b/gcc/rust/resolve/rust-ast-resolve-expr.h
@@ -69,6 +69,8 @@ public:
 
   void visit (AST::IfExprConseqIf &expr) override;
 
+  void visit (AST::IfLetExpr &expr) override;
+
   void visit (AST::BlockExpr &expr) override;
 
   void visit (AST::UnsafeBlockExpr &expr) override;