clpfd
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SWIPL ad SWISH: "ERROR: Syntax error: Operator expected" using #=
?- use_module(library(clpfd)).
true.
?- 4 #= 2*Y.
ERROR: Syntax error: Operator expected
ERROR: 4
ERROR: ** here **
ERROR: #= 2*Y .
?-
SWI-Prolog (threaded, 64 bits, version 9.0.4)