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3e2cde2c33
compiler/pred_table.m:
When we find more than one match for a predicate or function signature,
we used to generate an error message, print it, and then abort
compilation. Fix this by returning the error message to be handled
by our callers.
The compiler now has to pick one of the matches to continue with.
The compiler's pick (the first match) may not be the match intended
by the programmer, and it is possible that the compiler will later generate
some error messages that would not happen if we picked the match
intended by the programmer. We therefore warn the programmer about
this possibility.
compiler/purity.m:
compiler/resolve_unify_functor.m:
Include the error messages now returned by pred_table.m among
all the other error messages generated by the purity pass,
which, amongst other things, does the last part of the job
of the typechecker.
compiler/intermod.m:
Ignore the errors caused by unresolved overloading when generating
.opt files. They will be reported when the compiler tries to generate
target language code.
library/list.m:
Add three related utility predicates that we discussed earlier,
each of which was needed by one version or another of the code
for constructing the error message in pred_table.m.
NEWS:
Announce the additions to list.m.
tests/invalid_submodules/unresolved_overloading.{m,err_exp}:
Expect the updated error message, and the *absence* of a compiler abort.
15 lines
929 B
Plaintext
15 lines
929 B
Plaintext
unresolved_overloading.m:026: Error: unresolved predicate overloading.
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unresolved_overloading.m:026: The matches are
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unresolved_overloading.m:026: predicate
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unresolved_overloading.m:026: `unresolved_overloading.sub.loud_and_annoying'/3,
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unresolved_overloading.m:026: and
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unresolved_overloading.m:026: predicate
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unresolved_overloading.m:026: `unresolved_overloading.loud_and_annoying'/3.
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unresolved_overloading.m:026: You need to use an explicit module qualifier to
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unresolved_overloading.m:026: select the one you intend to refer to.
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unresolved_overloading.m:026: Proceeding on the assumption that the intended
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unresolved_overloading.m:026: match is the first. If this assumption is
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unresolved_overloading.m:026: incorrect, other error messages may be reported
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unresolved_overloading.m:026: for this predicate or function solely because
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unresolved_overloading.m:026: of this wrong assumption.
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