Add regression test for */& operators in functions/methods arguments

rinja_derive/src/generator.rs

@@ -1965,8 +1965,8 @@ impl<'a> Generator<'a> {
         ctx: &Context<'_>,
         buf: &mut Buffer,
         arg: &WithSpan<'_, Expr<'_>>,
-        // This variable is needed because `Expr::Unary` is not copyable but since we might
-        // skip a few levels.
+        // This parameter is needed because even though Expr::Unary is not copyable, we might still
+        // be able to skip a few levels.
         need_borrow: bool,
     ) -> Result<(), CompileError> {
         if let Expr::Unary(expr @ ("*" | "&"), ref arg) = **arg {

testing/tests/calls.rs

@@ -170,3 +170,46 @@ struct NotMethod;
 fn test_not_method() {
     assert_eq!(NotMethod.render().unwrap(), "a6");
 }
+
+#[derive(Template)]
+#[template(
+    source = "
+{{- bar(x) -}}
+{{- bar(&*x) -}}
+{{- foo(*x) -}}
+{{- foo(*&*x) -}}
+{# #} {{+ extra_fn::bar(x) -}}
+{{- extra_fn::bar(&*x) -}}
+{{- extra_fn::foo(*x) -}}
+{{- extra_fn::foo(*&*x) -}}
+",
+    ext = "txt"
+)]
+struct DerefMethodArg {
+    x: u32,
+}
+
+mod extra_fn {
+    pub fn bar(x: &u32) -> u32 {
+        *x + 4
+    }
+    pub fn foo(x: u32) -> u32 {
+        x + 5
+    }
+}
+
+impl DerefMethodArg {
+    fn bar(&self, x: &u32) -> u32 {
+        *x + 1
+    }
+    fn foo(&self, x: u32) -> u32 {
+        x
+    }
+}
+
+// This test ensures that the `*`/`&` operators are correctly placed on method/function arguments.
+#[test]
+fn test_deref_method_arg() {
+    let x = DerefMethodArg { x: 2 };
+    assert_eq!(x.render().unwrap(), "3322 6677");
+}