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