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Require non-zero coefficient ring in universal polynomial ring #1858

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Merged
merged 1 commit into from
Oct 11, 2024
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Require non-zero coefficient ring in universal polynomial ring #1858

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1 change: 1 addition & 0 deletions src/generic/UnivPoly.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -1170,6 +1170,7 @@ x*y - z
```
"""
function universal_polynomial_ring(R::Ring; cached::Bool=true, internal_ordering::Symbol=:lex)
@req !is_trivial(R) "Zero rings are currently not supported as coefficient ring."
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Having a period at the end is somewhat rare in our error messages. A quick experiment in Oscar.jl:

$ git grep -E 'error\(.*\."' | wc -l
     101
$ git grep -E 'error\(' | wc -l
    1526

and

$ git grep -E '@req.*\."' | wc -l
     137
$ git grep -E '@req.*"' | wc -l
    1599

So less than 10% of our @req calls use a trailing period. The numbers for error` are a bit less reliably because they miss the case were the string spans over more than one line but I don't think there will be a fundamentally different outcome.

Anyway I am merging this and the other PRs now as this is a very minor point and also a matter of taste.

T = elem_type(R)
U = mpoly_type(R)

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