Include arguments to the precondition check in failure messages

Author: saethlin

library/core/src/alloc/layout.rs

@@ -130,7 +130,7 @@ impl Layout {
         assert_unsafe_precondition!(
             check_library_ub,
             "Layout::from_size_align_unchecked requires that align is a power of 2 \
-            and the rounded-up allocation size does not exceed isize::MAX",
+            and the rounded-up allocation size does not exceed isize::MAX (size:{size}, align:{align})",
             (
                 size: usize = size,
                 align: usize = align,

library/core/src/ascii/ascii_char.rs

@@ -506,7 +506,7 @@ impl AsciiChar {
     pub const unsafe fn digit_unchecked(d: u8) -> Self {
         assert_unsafe_precondition!(
             check_language_ub,
-            "`ascii::Char::digit_unchecked` input cannot exceed 9.",
+            "`ascii::Char::digit_unchecked` input cannot exceed 9. (d:{d})",
             (d: u8 = d) => d < 10
         );