fix(core): adapt to the change in guaranteed_eq's return type

This change has occurred in [rust-lang/rust#101483][1].

[1]: rust-lang/rust#101483

Author: yvt

src/r3_core/src/closure.rs

@@ -138,7 +138,7 @@ impl Closure {
             } else {
                 let env = core::intrinsics::const_allocate(size, align);
                 assert!(
-                    !env.guaranteed_eq(core::ptr::null_mut()),
+                    !env.guaranteed_eq(core::ptr::null_mut()).unwrap_or(false),
                     "heap allocation failed"
                 );
                 env.cast::<T>().write(func);

src/r3_core/src/utils/freeze.rs

@@ -58,7 +58,7 @@ impl<T: Copy> Frozen<T> {
             // Allocate a CTFE heap memory block
             let ptr = core::intrinsics::const_allocate(size, align).cast::<T>();
             assert!(
-                !ptr.guaranteed_eq(core::ptr::null_mut()),
+                !ptr.guaranteed_eq(core::ptr::null_mut()).unwrap_or(false),
                 "heap allocation failed"
             );