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20b77c995e
compiler/parse_dcg_goal.m:
The DCG transformation adds unifications to the then-parts and else-parts
of if-then-elses. Use the contexts of the actual user code in these parts
for the compiler-generated conjunctions of which they are part.
tests/invalid/dcg_context.{m,err_exp}:
The test case from m-users which motivated this change. The error message
generated by the compiler for this code used the same context for
both the user-written then-part and the compiler-created else part
of an if-then (no else) goal in a DCG clause. The fix makes it clear,
in this instance and most others, that when mode analysis complains
about a mismatch between the two arms of the if-then-else, it is
talking about two separate pieces of code.
tests/invalid/Mmakefile:
Enable the new test case.
11 lines
578 B
Plaintext
11 lines
578 B
Plaintext
dcg_context.m:076: In clause for `get_class_super(out, out, in, out)':
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dcg_context.m:076: mode mismatch in if-then-else.
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dcg_context.m:076: The variable `Class' is ground in some branches but not
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dcg_context.m:076: others.
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dcg_context.m:076: In this branch, `Class' is free.
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dcg_context.m:077: In this branch, `Class' is ground.
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dcg_context.m:076: The variable `MaybeSuper' is ground in some branches but
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dcg_context.m:076: not others.
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dcg_context.m:076: In this branch, `MaybeSuper' is free.
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dcg_context.m:077: In this branch, `MaybeSuper' is ground.
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