SF patch 763201: handling of SyntaxErrors in symbol table build Fixes for three related bugs, including errors that caused a script to be ignored without printing an error message. The key problem was a bad interaction between syntax warnings and syntax errors. If an exception was already set when a warning was issued, the warning could clobber the exception. The PyErr_Occurred() check in issue_warning() isn't entirely satisfying (the caller should know whether there was already an error), but a better solution isn't immediately obvious. Bug fix candidate.