proc openParser(p: var Parser; fileIdx: FileIndex; inputstream: PLLStream;
                cache: IdentCache; config: ConfigRef) {....raises: [IOError,
    Exception, ValueError, KeyError, OSError, ERecoverableError], tags: [
    ReadIOEffect, RootEffect, ReadDirEffect, WriteIOEffect, ReadEnvEffect].}

proc parseFile(fileIdx: FileIndex; cache: IdentCache; config: ConfigRef): PNode {....raises: [
    Exception, ValueError, KeyError, OSError, IOError, ERecoverableError], tags: [
    RootEffect, ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

proc setupParser(p: var Parser; fileIdx: FileIndex; cache: IdentCache;
                 config: ConfigRef): bool {....raises: [Exception, ValueError,
    KeyError, OSError, IOError, ERecoverableError], tags: [RootEffect,
    ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}