fix detection of function argument shadowing (closes #9374)

src/filters/renameVars.ml

@@ -194,7 +194,7 @@ let collect_loop scope fn =
 let rec collect_vars ?(in_block=false) rc scope e =
 	let collect_vars =
 		match e.eexpr with
-		| TBlock _ -> collect_vars ~in_block:true rc
+		| TBlock _ | TFunction _ -> collect_vars ~in_block:true rc
 		| _ -> collect_vars ~in_block:false rc
 	in
 	match e.eexpr with
@@ -210,7 +210,10 @@ let rec collect_vars ?(in_block=false) rc scope e =
 		let scope = create_scope (Some scope) in
 		List.iter (fun (v,_) -> declare_var rc scope v) fn.tf_args;
 		List.iter (fun (v,_) -> use_var rc scope v) fn.tf_args;
-		collect_vars scope fn.tf_expr
+		(match fn.tf_expr.eexpr with
+		| TBlock exprs -> List.iter (collect_vars scope) exprs
+		| _ -> collect_vars scope fn.tf_expr
+		)
 	| TTry (try_expr, catches) ->
 		collect_vars scope try_expr;
 		List.iter (fun (v, catch_expr) ->

tests/unit/src/unit/issues/Issue9374.hx

@@ -0,0 +1,13 @@
+package unit.issues;
+
+class Issue9374 extends unit.Test {
+	function test() {
+		eq(123, clash(321));
+	}
+
+	@:analyzer(no_local_dce)
+	function clash(name:Int):Int {
+		var name = 123;
+		return name;
+	}
+}