tests: add underscore

Signed-off-by: Benno Lossin <[email protected]>

Author: BennoLossin

tests/underscore.rs

@@ -0,0 +1,18 @@
+use pin_init::{init, Init};
+
+pub struct Foo {
+    x: u64,
+    y: u64,
+}
+
+impl Foo {
+    pub fn new() -> impl Init<Self> {
+        init!(Self {
+            _: {
+                let z = 42;
+            },
+            x: z,
+            y: z,
+        })
+    }
+}