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Give a better error message for nonexistent modules specified
in `:- import_module' or `:- include_module' declarations.
compiler/make.m:
compiler/make.dependencies.m:
compiler/make.module_dep_file.m:
Track which module imported or included the module
currently being processed when generating dependencies,
and include the name of the importing module in the error
message generated when a module can't be found.
tests/invalid/Mmakefile:
tests/invalid/nonexistent_import.{m,err_exp}:
Test case.
