I can confirm that the sos method (without an argument) fails under Catalina. 
See e.g. HOL/ex/SOS.thy.

Larry

> On 27 Nov 2019, at 18:28, Lawrence Paulson <[email protected]> wrote:
> 
> It’s for the sos method. Didn’t realise we were losing this.
> 
> See https://www.cl.cam.ac.uk/~jrh13/slides/mit-16apr10/slides.pdf
> 
> Larry

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