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diff --git a/src/test/ui/async-await/issues/issue-95307.rs b/src/test/ui/async-await/issues/issue-95307.rs
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+// edition:2018
+
+// Regression test for #95307.
+// The ICE occurred on all the editions, specifying edition:2018 to reduce diagnostics.
+
+pub trait C {
+    async fn new() -> [u8; _];
+    //~^ ERROR: functions in traits cannot be declared `async`
+    //~| ERROR: using `_` for array lengths is unstable
+    //~| ERROR: in expressions, `_` can only be used on the left-hand side of an assignment
+}
+
+fn main() {}