Fixes missing overflow lint for i64 #14269

The `type_overflow` lint, doesn't catch the overflow for `i64` because
the overflow happens earlier in the parse phase when the `u64` as biggest
possible int gets casted to `i64` , without checking the for overflows.
We can't lint in the parse phase, so a refactoring of the `LitInt` type
was necessary.

The types `LitInt`, `LitUint` and `LitIntUnsuffixed` where merged to one
type `LitInt` which stores it's value as `u64`. An additional parameter was
added which indicate the signedness of the type and the sign of the value.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libfourcc/lib.rs b/src/libfourcc/lib.rs
index 4596c98cffd..bac5b6e1013 100644
--- a/src/libfourcc/lib.rs
+++ b/src/libfourcc/lib.rs
@@ -124,7 +124,7 @@ pub fn expand_syntax_ext(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
             (val << 8) | (byte as u32)
         };
     }
-    let e = cx.expr_lit(sp, ast::LitUint(val as u64, ast::TyU32));
+    let e = cx.expr_lit(sp, ast::LitInt(val as u64, ast::UnsignedIntLit(ast::TyU32)));
     MacExpr::new(e)
 }