name-resolution: Handle let-else properly

gcc/rust/ChangeLog:

	* resolve/rust-ast-resolve-stmt.h: Add handling for diverging else.
	* resolve/rust-late-name-resolver-2.0.cc (Late::visit): Likewise.

Author: CohenArthur

gcc/rust/resolve/rust-ast-resolve-stmt.h

@@ -73,9 +73,10 @@ class ResolveStmt : public ResolverBase
   void visit (AST::LetStmt &stmt) override
   {
     if (stmt.has_init_expr ())
-      {
-	ResolveExpr::go (stmt.get_init_expr (), prefix, canonical_prefix);
-      }
+      ResolveExpr::go (stmt.get_init_expr (), prefix, canonical_prefix);
+
+    if (stmt.has_else_expr ())
+      ResolveExpr::go (stmt.get_else_expr (), prefix, canonical_prefix);
 
     PatternDeclaration::go (stmt.get_pattern (), Rib::ItemType::Var);
     if (stmt.has_type ())

gcc/rust/resolve/rust-late-name-resolver-2.0.cc

@@ -140,6 +140,9 @@ Late::visit (AST::LetStmt &let)
     visit (let.get_init_expr ());
   visit (let.get_pattern ());
 
+  if (let.has_else_expr ())
+    visit (let.get_init_expr ());
+
   // how do we deal with the fact that `let a = blipbloup` should look for a
   // label and cannot go through function ribs, but `let a = blipbloup()` can?