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In commit f2ce81c, support for multiple path splitters was added. The type of SplitPath changed from string to []string, and splitPos was changed to loop through all values in SplitPath. Before that commit, if SplitPath was empty, strings.Index returned 0 and PATH_INFO was set correctly in buildEnv. Currently, however, splitPos returns -1 for empty values of SplitPath, behaving as if a split position could not be found at all. PATH_INFO is then never set in buildEnv and remains empty. Restore the old behaviour by explicitly checking whether SplitPath is empty and returning 0 in splitPos. Closes #3490