gccrs: hir: Improve pattern bindings handling in closure parameters

gcc/rust/ChangeLog:

	* backend/rust-compile-expr.cc (CompileExpr::generate_closure_function):
	handle closure parameters pattern bindings using CompilePatternBindings visitor

gcc/testsuite/ChangeLog:

	* rust/execute/torture/closure4.rs: New test.
	* rust/execute/torture/ref-pattern2.rs: New test.

Signed-off-by: Mahmoud Mohamed <mahadelr19@gmail.com>

3 files changed, 38 insertions, 3 deletions

diff --git a/gcc/rust/backend/rust-compile-expr.cc b/gcc/rust/backend/rust-compile-expr.cc
index 1a98f4a..3d47d43 100644
--- a/gcc/rust/backend/rust-compile-expr.cc
+++ b/gcc/rust/backend/rust-compile-expr.cc
@@ -2918,9 +2918,8 @@ CompileExpr::generate_closure_function (HIR::ClosureExpr &expr,
       tree compiled_param_var = ctx->get_backend ()->struct_field_expression (
 	args_param_expr, i, closure_param.get_locus ());
 
-      const HIR::Pattern &param_pattern = *closure_param.get_pattern ();
-      ctx->insert_pattern_binding (
-	param_pattern.get_pattern_mappings ().get_hirid (), compiled_param_var);
+      CompilePatternBindings::Compile (closure_param.get_pattern ().get (),
+				       compiled_param_var, ctx);
       i++;
     }
 
diff --git a/gcc/testsuite/rust/execute/torture/closure4.rs b/gcc/testsuite/rust/execute/torture/closure4.rs
new file mode 100644
index 0000000..07dca44
--- /dev/null
+++ b/gcc/testsuite/rust/execute/torture/closure4.rs
@@ -0,0 +1,22 @@
+#[lang = "fn_once"]
+pub trait FnOnce<Args> {
+    #[lang = "fn_once_output"]
+    type Output;
+
+    extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
+}
+
+struct Foo(i32, i32);
+
+fn main() -> i32 {
+  let foo = |&x: &i32, y: i32| -> i32 {
+    x + y
+  };
+  
+  let bar = |Foo(x, y): Foo| -> i32 {
+    x + y
+  };
+
+  let a = 4;
+  foo(&a, 2) + bar(Foo(100, 200)) - 306
+}
diff --git a/gcc/testsuite/rust/execute/torture/ref-pattern2.rs b/gcc/testsuite/rust/execute/torture/ref-pattern2.rs
new file mode 100644
index 0000000..4c9e755
--- /dev/null
+++ b/gcc/testsuite/rust/execute/torture/ref-pattern2.rs
@@ -0,0 +1,14 @@
+#[lang = "fn_once"]
+pub trait FnOnce<Args> {
+    #[lang = "fn_once_output"]
+    type Output;
+
+    extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
+}
+
+fn main() -> i32 {
+  let foo = |&&d: &&i32| -> i32 { d };
+
+  let x = &&5i32;
+  foo(x) - 5
+}