Add test for rust-lang#56445

Author: JohnTitor

src/test/ui/impl-trait/issue-56445.rs

@@ -0,0 +1,26 @@
+// Regression test for https://github.com/rust-lang/rust/issues/56445#issuecomment-629426939
+// check-pass
+
+#![crate_type = "lib"]
+
+use std::marker::PhantomData;
+
+pub struct S<'a>
+{
+    pub m1: PhantomData<&'a u8>,
+    pub m2: [u8; S::size()],
+}
+
+impl<'a> S<'a>
+{
+    pub const fn size() -> usize { 1 }
+
+    pub fn new() -> Self
+    {
+        Self
+        {
+            m1: PhantomData,
+            m2: [0; Self::size()],
+        }
+    }
+}