Bumps the line number for the singleton warning. When the singleton
occurs on the same line at the term starts, the line number is correct:
foo(X).
However it stills mis-reports this line number as 1 instead of 5:
foo(1) :-
true,
true,
true,
Y.
See issue #1356.
This fixes#2725, by making it so that `strip_module(Pred, M, P), call(M:P)`
doesn't throw an `instanciation_error` when `Pred` isn't in the form `module:predicate`.
Now, `strip_module(hello, M, P)` will call `load_context(M)`, which unifies `M`
with the topmost module (or `user`).
Two new test cases are added: issue2725.pl, which tests the minimal case id(X) --> X.
and the strip_module(P, M, _), call(M:P) scenario, and module_resolution,
which tests the behavior of strip_module in a few scenarios.
- this re-enables line ending and file path normalization
- the latter might be unwanted, but there is only a shared flag
- this might result in too loose matching of / and \ in stdout and stderr as prolog syntax may be mistaken for a path
