Expand let-else allow tests
The #[allow(...)] directive was tested for the body and the pattern,
but non-presence of it wasn't tested. Furthermore, it wasn't tested
for the expression. We add expression tests as well as ones checking
the non-presence of the directive.
diff --git a/src/test/ui/let-else/let-else-allow-in-expr.stderr b/src/test/ui/let-else/let-else-allow-in-expr.stderr
new file mode 100644
index 0000000..e86bcbc8
--- /dev/null
+++ b/src/test/ui/let-else/let-else-allow-in-expr.stderr
@@ -0,0 +1,20 @@
+error: unused variable: `x`
+ --> $DIR/let-else-allow-in-expr.rs:7:13
+ |
+LL | let x = 1;
+ | ^ help: if this is intentional, prefix it with an underscore: `_x`
+ |
+note: the lint level is defined here
+ --> $DIR/let-else-allow-in-expr.rs:3:9
+ |
+LL | #![deny(unused_variables)]
+ | ^^^^^^^^^^^^^^^^
+
+error: unused variable: `x`
+ --> $DIR/let-else-allow-in-expr.rs:29:9
+ |
+LL | let x = 1;
+ | ^ help: if this is intentional, prefix it with an underscore: `_x`
+
+error: aborting due to 2 previous errors
+
