Add test for issue-56445

Author: JohnTitor

src/test/ui/const-generics/issues/issue-56445.rs

@@ -0,0 +1,12 @@
+// Regression test for https://github.com/rust-lang/rust/issues/56445#issuecomment-518402995.
+
+#![feature(const_generics)]
+//~^ WARN: the feature `const_generics` is incomplete
+#![crate_type = "lib"]
+
+use std::marker::PhantomData;
+
+struct Bug<'a, const S: &'a str>(PhantomData<&'a ()>);
+//~^ ERROR: use of non-static lifetime `'a` in const generic
+
+impl Bug<'_, ""> {}

src/test/ui/const-generics/issues/issue-56445.stderr

@@ -0,0 +1,20 @@
+warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-56445.rs:3:12
+   |
+LL | #![feature(const_generics)]
+   |            ^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+
+error[E0771]: use of non-static lifetime `'a` in const generic
+  --> $DIR/issue-56445.rs:9:26
+   |
+LL | struct Bug<'a, const S: &'a str>(PhantomData<&'a ()>);
+   |                          ^^
+   |
+   = note: for more information, see issue #74052 <https://github.com/rust-lang/rust/issues/74052>
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0771`.