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This whitespace was not part of anything being tested, and it
introduces differences (that we don't actually care about) between the
output of "gcc -E" and glcpp.
Just eliminate this extra whitespace to reduce spurious test-case
failures.
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This shows two minor failures in our current parsing (resulting in
whitespace-only changes, oso not that significant):
1. We are inserting extra whitespace between tokens not originally
separated by whitespace in the replacement list of a macro
definition.
2. We are swallowing whitespace separating tokens in the general
content.
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Our current parser sees "#define foo (" as an identifier token
followed by a '(' token and parses this as a function-like macro.
That would be correct for "#define foo(" but the preprocessor
specification treats this whitespace as significant here so this test
currently fails.
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