determine ldc version in static if or version?

[Adam D. Ruppe]

I want to do like

static if(__LDC_VERSION == 1.19) {
   // declaration
}


All the tricks I know that I have tried so far give the dmd 
numbers. Perhaps I could use that to identify a particular 
version as a hack, but I specifically am curious about the ldc 
version because of a change they made there independently of D.

Is there something I don't know about?