log errors to stderr, not stdout.
log errors to stderr, not stdout.

A-Manning/FStar,YaccConstructor/FStar,hoheinzollern/FStar,MallabaevAzamat/FStar,YaccConstructor/FStar,hoheinzollern/FStar,hoheinzollern/FStar,A-Manning/FStar,YaccConstructor/FStar,FStarLang/FStar,A-Manning/FStar,hoheinzollern/FStar,MallabaevAzamat/FStar,FStarLang/FStar,YaccConstructor/FStar,FStarLang/FStar,MallabaevAzamat/FStar,MallabaevAzamat/FStar