cdecl-9.6

Specific languages in error messages
Rather than just say " is not supported in ", now says " is not supported until ."

More constructor & destructor warning checks
Constructors and destructors are now checked for throw. Constructor parameters are now checked for warnings.

Reserved identifier warnings
Warnings are now given for names that are reserved identifiers, specifically names that match the patterns _[A-Z_]* (C and C++) or *__* (C++ only).

Type redefinition error now includes existing type
If you attempt to redefine an existing type with a different type, the error message now includes the existing type.

Fixed thread_local
thread_local is now correctly allowed only in C11 or C++11 or later.

Function auto parameters in C++20
Functions in C++20 now allow auto parameters.

_Bool
_Bool is now recognized only in C99 and later and not in C++.

imaginary
imaginary is now mapped only to _Imaginary in C99 and later and not in C++.

throw() in C++20
throw() is no longer supported in C++20.

Fixed args help
The help for args no longer prints <name> for when the current language is either C2X or C++.