Hi Johan,

On 3 Aug., 09:36, "Johan S. R. Nielsen" <j.s.r.niel...@mat.dtu.dk>
wrote:
> Oh, yes, I see: "sage -b" does indeed only build changed files and
> their dependencies; I must have been working on a quite fundamental
> module last time I tried. Why doesn't the Developer's Guide refer to
> "sage -tnew" for when doc-testing?

This would be dangerous.

Typically, if a patch causes problems, then it is a problem in the
doctests of a completely different file. Example: I recently had a
change in the GAP interface representation of cyclotomic fields (so, I
changed sage/rings/number_field/). As a result, a doctest in sage/
interface/gap broke. But the reason was in fact a bug in the PARI
interface. Those things would be impossible to find without full
doctesting.

Cheers,
Simon

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