Add regression tests for #56445

Closes #56445.

src/test/ui/const-generics/issues/issue-56445.full.stderr → src/test/ui/const-generics/issues/issue-56445-1.full.stderr

 warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/issue-56445.rs:3:27
+  --> $DIR/issue-56445-1.rs:3:27
    |
 LL | #![cfg_attr(full, feature(const_generics))]
    |                           ^^^^^^^^^^^^^^
@@ -8,7 +8,7 @@ LL | #![cfg_attr(full, feature(const_generics))]
    = 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:8:26
+  --> $DIR/issue-56445-1.rs:8:26
    |
 LL | struct Bug<'a, const S: &'a str>(PhantomData<&'a ()>);
    |                          ^^

src/test/ui/const-generics/issues/issue-56445.min.stderr → src/test/ui/const-generics/issues/issue-56445-1.min.stderr

 error[E0771]: use of non-static lifetime `'a` in const generic
-  --> $DIR/issue-56445.rs:8:26
+  --> $DIR/issue-56445-1.rs:8:26
    |
 LL | struct Bug<'a, const S: &'a str>(PhantomData<&'a ()>);
    |                          ^^

src/test/ui/const-generics/issues/issue-56445-2.rs

+// Regression test for https://github.com/rust-lang/rust/issues/56445#issuecomment-502095133
+struct OnDiskDirEntry<'a> { _s: &'a usize }
+
+impl<'a> OnDiskDirEntry<'a> {
+    const LFN_FRAGMENT_LEN: usize = 2;
+
+    fn lfn_contents(&self) -> [char; Self::LFN_FRAGMENT_LEN] { loop { } }
+    //~^ ERROR: generic `Self` types are currently not permitted in anonymous constants
+}
+
+fn main() {}

src/test/ui/const-generics/issues/issue-56445-2.stderr

+error: generic `Self` types are currently not permitted in anonymous constants
+  --> $DIR/issue-56445-2.rs:7:38
+   |
+LL |     fn lfn_contents(&self) -> [char; Self::LFN_FRAGMENT_LEN] { loop { } }
+   |                                      ^^^^
+   |
+note: not a concrete type
+  --> $DIR/issue-56445-2.rs:4:10
+   |
+LL | impl<'a> OnDiskDirEntry<'a> {
+   |          ^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+

src/test/ui/const-generics/issues/issue-56445-3.rs

+// Regression test for https://github.com/rust-lang/rust/issues/56445#issuecomment-524494170
+pub struct Memory<'rom> {
+    rom: &'rom [u8],
+    ram: [u8; Self::SIZE],
+    //~^ ERROR: generic `Self` types are currently not permitted in anonymous constants
+}
+
+impl<'rom> Memory<'rom> {
+    pub const SIZE: usize = 0x8000;
+}
+
+fn main() {}

src/test/ui/const-generics/issues/issue-56445-3.stderr

+error: generic `Self` types are currently not permitted in anonymous constants
+  --> $DIR/issue-56445-3.rs:4:15
+   |
+LL |     ram: [u8; Self::SIZE],
+   |               ^^^^
+
+error: aborting due to previous error
+