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remove failing append choicepoint in atom_concat/3 special case (#1893)

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Mark
2023-07-18 14:44:02 -06:00
parent 1ba040c24d
commit 14646074be
1 changed files with 8 additions and 3 deletions
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11
src/lib/builtins.pl
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@@ -1559,9 +1559,14 @@ atom_concat(Atom_1, Atom_2, Atom_12) :-
( var(Atom_12) ->
throw(error(instantiation_error, atom_concat/3))
; atom_chars(Atom_12, Atom_12_Chars),
lists:append(BeforeChars, AfterChars, Atom_12_Chars),
atom_chars(Atom_1, BeforeChars),
atom_chars(Atom_2, AfterChars)
( var(Atom_2) ->
lists:append(BeforeChars, AfterChars, Atom_12_Chars),
atom_chars(Atom_2, AfterChars)
; atom_chars(Atom_2, AfterChars),
lists:append(BeforeChars, AfterChars, Atom_12_Chars),
!
),
atom_chars(Atom_1, BeforeChars)
)
; var(Atom_2) ->
( var(Atom_12) -> throw(error(instantiation_error, atom_concat/3))