Ok, thank you. So no bug at all, great!

Daniel Diaz schrieb:
Hi,

can you give me the exact error message for X = `\` ?
If it is

    | ?- X = `\`.
    uncaught exception: error(syntax_error('user_input:1 (char:8)
    expression expected or previous operator needs brackets'),read_term/3)

it is due to the fact \ is also an operator and thus needs to be put inside ( ) as an argument of another operator (here it is =). Use instead:

    | ?- X = (`\`).

    X = \

Daniel

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