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To speed features up, especially in editor we should introduce "preamble" - some state of internal structures at some point of file. I.e. 1) remembering macro table at the end of last #include directive allows to prevent any I/O when reconstruct recently modified file in editor. 2) remembering symtab at the end of last #include directive allows to have faster code completion and semantic HL Preamble can be created during editor initalization phase or be triggered by opening editor.