discriminant for C should fint in int/uint

Author: ModProg

tests/discriminant.rs

@@ -504,7 +504,7 @@ fn repr_c_negative() {
 	#[derive_where(PartialEq, PartialOrd)]
 	#[repr(C)]
 	enum Test {
-		A = -0x8000_0000_0000_0000_isize,
+		A = (-0x8000_0000_i32) as isize,
 		B,
 		#[allow(dead_code)]
 		#[derive_where(incomparable)]
@@ -533,7 +533,7 @@ fn repr_c_expr() {
 	#[derive_where(PartialEq, PartialOrd)]
 	#[repr(C)]
 	enum Test {
-		A = isize::MAX - 2,
+		A = (u32::MAX - 2) as isize,
 		B,
 		#[allow(dead_code)]
 		#[derive_where(incomparable)]