Remove unneeded exit conditions for parse_stream
#3916
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As I understand it, the code operates line-by-line. When finding `__END__`, it has to decide if it is the end marker or just appears as part of of a multi-line literal (see tests). For a future PR I plan to make, `lex_modes` may be empty after parsing finished, even if it was syntax invalid. Currently there will _always_ be errors when lex modes are not popped. So these extra checks are redundant. Basically, if we found `__END__` on a line by itself and there are syntax errors, it's impossible to be the end marker.
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As I understand it, the code operates line-by-line. When finding
__END__, it has to decide if it is the end marker or just appears as part of of a multi-line literal (see tests).Basically, if we found
__END__on a line by itself and there are syntax errors, it's impossible to be the end marker.This is in preparation for #3911. That issue is caused by
lex_modesnot being properly reset after reaching EOF during heredoc body parsing. It is still inPM_LEX_EMBEXPRmode, which causes it to not reset the parser to the heredoc identifier end.Tests are just formatted so it's better to see what they are doing.