demangle()

[Andrew via Digitalmars-d-learn]

When I run the DMD profile, the "overview" at the end of the 
trace.log contains some mangles names (such as:

_D3std5stdio4File17LockingTextWriter12__T3putTAyaZ3putMFAyaZ13trustedFwriteFNbNiNexPvmmPOS4core4stdc5stdio7__sFILEZm

When I call demangle() on those mangled names it returns the 
mangled name, presumably because it can't detangle the name 
(according to the spec).

How do I get the demangled name?  Why can't it demangle?  What is 
the consequence to my program of its inability to demangle (is it 
a many to 1?)?

Thanks