a.golf

dan@athena:~/Source/raku/rakudo$ RAKUDO_RAKUAST=1 ./rakudo-m -e 'class A { has $.b is built(True) }'
callee.is-resolved = True nqp::istype(callee.resolution, RakuAST::CompileTimeValue) = 1 args.IMPL-CAN-INTERPRET = False
callee: Var::Lexical::Constant 【&trait_mod:<is>】

callee origin: 
args: ArgList
  Declaration::ResolvedConstant
  ColonPair::Value
    Circumfix::Parentheses  ⎡(True)⎤
      SemiList  ⎡True⎤
        Statement::Expression  ⎡True⎤
          Term::Name  ⎡True⎤
            Name 【True】  ⎡True⎤

args origin: 
===SORRY!=== Error while compiling -e
BEGIN time calls only supported for simple constructs so far
at -e:1