#2021-09-14 23:19:12: client19: OPTexpandMultiplex: !WARNING: To speedup user.my a bulk operator implementation is needed for     z:bat[:int] := mal.multiplex("user":str, "my":str, b:bat[:int], 1:int);	#[2] (0) MANIFOLDremapMultiplex 3 <- 4 5 1 6 
#2021-09-14 23:19:12: client36: createExceptionInternal: !ERROR: MALException:mal.multiplex:Function 'user.foo' not defined
#2021-09-14 23:19:12: client46: OPTexpandMultiplex: !WARNING: To speedup calc.+ a bulk operator implementation is needed for     c:bat[:int] := mal.multiplex("calc":str, "+":str, b:bat[:int], 1:int);	#[3] (0) MANIFOLDremapMultiplex 5 <- 6 7 1 4 
#2021-09-14 23:19:12: client48: createExceptionInternal: !ERROR: MALException:chkFlow:user.main 'X' may not be used before being initialized