Function heap_describe 

pub unsafe fn heap_describe(ptr: *const u8) -> String

Describes a heap object in human-readable form.

Returns a string like:

• Lit(Int#, 42)
• Con(tag=12345, 2 fields)
• Closure(code=0x..., 3 captures) [repl_lambda_5]
• INVALID(tag=255, ptr=0x...)

Safety

ptr must point to a valid heap object, or at least readable memory.