From 268d8250fb0a9cdcbbd760bdf39424ed02fd1920 Mon Sep 17 00:00:00 2001
From: René Kijewski <kijewski@library.vetmed.fu-berlin.de>
Date: Sat, 17 Jul 2021 13:40:49 +0200
Subject: Use "target()" to parse "when" block

`target()` as used in parsing "let" and "if let" implements parsing
nested tuples and structs. But it does not implement parsing literals.

The functions `match_variant()` and `with_parameters()` as used in
parsing "when" blocks do not implement parsing nested structs, but it
implements parsing literals.

This PR combines `match_variant()` and `with_parameters()` into
`target()`, so that all `{%when%}` support nested structs, too.
---
 testing/tests/ui/lit_on_assignment_lhs.rs     | 11 +++++++++++
 testing/tests/ui/lit_on_assignment_lhs.stderr |  7 +++++++
 2 files changed, 18 insertions(+)
 create mode 100644 testing/tests/ui/lit_on_assignment_lhs.rs
 create mode 100644 testing/tests/ui/lit_on_assignment_lhs.stderr

(limited to 'testing/tests/ui')

diff --git a/testing/tests/ui/lit_on_assignment_lhs.rs b/testing/tests/ui/lit_on_assignment_lhs.rs
new file mode 100644
index 0000000..1793770
--- /dev/null
+++ b/testing/tests/ui/lit_on_assignment_lhs.rs
@@ -0,0 +1,11 @@
+use askama::Template;
+
+#[derive(Template)]
+#[template(
+    source = "{%let 7=x%}",
+    ext = "txt"
+)]
+struct MyTemplate;
+
+fn main() {
+}
diff --git a/testing/tests/ui/lit_on_assignment_lhs.stderr b/testing/tests/ui/lit_on_assignment_lhs.stderr
new file mode 100644
index 0000000..fa488cb
--- /dev/null
+++ b/testing/tests/ui/lit_on_assignment_lhs.stderr
@@ -0,0 +1,7 @@
+error: proc-macro derive panicked
+ --> $DIR/lit_on_assignment_lhs.rs:3:10
+  |
+3 | #[derive(Template)]
+  |          ^^^^^^^^
+  |
+  = help: message: Cannot have literals on the left-hand-side of an assignment.
-- 
cgit