proc searchForProc(c: PContext; scope: PScope; fn: PSym): tuple[proto: PSym,
    comesFromShadowScope: bool] {....raises: [KeyError, ValueError, IOError,
    Exception, OSError, ERecoverableError], tags: [WriteIOEffect, ReadDirEffect,
    RootEffect, ReadEnvEffect, ReadIOEffect], forbids: [].}