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William Stein authored
Added a "Warning" class, and changed it so redeclaring or re-importing is a warning rather than an error. Because Pyrex has no #ifndef macro, it is impossibly painful to use pxi files for declarations in a large project. SAGE is a large project. Also, in Python it is not an error to import a module twice. Thus more in line with Python's behavior, multiple declarations of the same symbol is no longer an error.
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