XCB
1.13.1
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For pre-code generated by expression generation (for example, the for-loop of a sumof) This has to account for recursiveness of the expression generation, i.e., there may be pre-code for pre-code. Therefore this is implemented as a stack of lists of lines. If redirection is switched on, then all output is collected in self.redirect_code and self.redirect_tempvars instead of being sent to the output via _h und _c.