Add regression test

Author: oli-obk

Diff for: tests/ui/pattern/overflowing-literals.rs

@@ -0,0 +1,20 @@
+//! Check that overflowing literals are in patterns are rejected
+
+#![feature(pattern_types)]
+#![feature(pattern_type_macro)]
+
+use std::pat::pattern_type;
+
+type TooBig = pattern_type!(u8 is 500..);
+//~^ ERROR:  literal out of range for `u8`
+type TooSmall = pattern_type!(i8 is -500..);
+//~^ ERROR:  literal out of range for `i8`
+type TooBigSigned = pattern_type!(i8 is 200..);
+//~^ ERROR:  literal out of range for `i8`
+
+fn main() {
+    match 5_u8 {
+        500 => {}
+        _ => {}
+    }
+}

Diff for: tests/ui/pattern/overflowing-literals.stderr

@@ -0,0 +1,29 @@
+error: literal out of range for `u8`
+  --> $DIR/overflowing-literals.rs:8:35
+   |
+LL | type TooBig = pattern_type!(u8 is 500..);
+   |                                   ^^^
+   |
+   = note: the literal `500` does not fit into the type `u8` whose range is `0..=255`
+   = note: `#[deny(overflowing_literals)]` on by default
+
+error: literal out of range for `i8`
+  --> $DIR/overflowing-literals.rs:10:37
+   |
+LL | type TooSmall = pattern_type!(i8 is -500..);
+   |                                     ^^^^
+   |
+   = note: the literal `-500` does not fit into the type `i8` whose range is `-128..=127`
+   = help: consider using the type `i16` instead
+
+error: literal out of range for `i8`
+  --> $DIR/overflowing-literals.rs:12:41
+   |
+LL | type TooBigSigned = pattern_type!(i8 is 200..);
+   |                                         ^^^
+   |
+   = note: the literal `200` does not fit into the type `i8` whose range is `-128..=127`
+   = help: consider using the type `u8` instead
+
+error: aborting due to 3 previous errors
+