Fix =!=> for runtime hypotheses - #431
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When the LHS of =!=> was not comptime known, the runtime implementation added a head cut instead of a tail cut.
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When the LHS of =!=> was not comptime-known, the runtime implementation added a head cut instead of a tail cut.
Before the patch, running the new test with
dune exec elpi -- -test tests/sources/implbang_runtime.elpi -trace-on -trace-at run 1 4 -trace-only user:new-hypswould giveuser:new-hyps = (p A0) :- !, (A0 = 2)., while the analogousimplbang.elpiwith comptime-known LHS gives the expecteduser:new-hyps = (p A0) :- (A0 = 2), !.