"Reference to non-static member function must be called" build failure(s) — clang 6.0

PackageVersionSupposed error messageFull log Bug report
bisonc++ 6.01.03-1./parserbase.h:318:24: error: reference to non-static member function must be called; did you mean to call it with no arguments? Log
blitz++ 1:0.10+ds-2../../blitz/array/stencil-classes.cc:15126:20: error: reference to non-static member function must be called Log
flexc++ 2.06.04-1./../parser/parserbase.h:324:24: error: reference to non-static member function must be called; did you mean to call it with no arguments? Log

3 errors