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