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## This is proposed interface in https://github.com/sass/libsass/pull/1288
Additional debugging macros with low overhead are available, `TRACE()` and `TRACEINST()`.
Both macros simulate a string stream, so they can be used like this:
TRACE() << "Reached.";
produces:
[LibSass] parse_value parser.cpp:1384 Reached.
`TRACE()`
logs function name, source filename, source file name to the standard error and the attached
stream to the standard error.
`TRACEINST(obj)`
logs object instance address, function name, source filename, source file name to the standard error and the attached stream to the standard error, for example:
TRACEINST(this) << "String_Constant created " << this;
produces:
[LibSass] 0x8031ba980:String_Constant ./ast.hpp:1371 String_Constant created (0,"auto")
The macros generate output only of `LibSass_TRACE` is set in the environment.