Fix interface test for string_tree to handle abstract strings

[MilesCranmer]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 11644840863

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.347%

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Totals
Change from base Build 11546363162:	0.0%
Covered Lines:	2418
Relevant Lines:	2536

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💛 - Coveralls

[github-actions]

Benchmark Results

	master	9232a99...	master/9232a99aa0e901...
eval/ComplexF32/evaluation	7.22 ± 0.56 ms	7.16 ± 0.54 ms	1.01
eval/ComplexF64/evaluation	10.6 ± 0.74 ms	10.6 ± 0.74 ms	1
eval/Float32/derivative	11.2 ± 0.72 ms	11.2 ± 0.94 ms	1
eval/Float32/derivative_turbo	11.3 ± 0.76 ms	11 ± 0.71 ms	1.02
eval/Float32/evaluation	2.73 ± 0.25 ms	2.71 ± 0.24 ms	1.01
eval/Float32/evaluation_bumper	0.571 ± 0.015 ms	0.564 ± 0.015 ms	1.01
eval/Float32/evaluation_turbo	0.545 ± 0.032 ms	0.524 ± 0.032 ms	1.04
eval/Float32/evaluation_turbo_bumper	0.571 ± 0.014 ms	0.571 ± 0.015 ms	1
eval/Float64/derivative	14.6 ± 0.54 ms	14.3 ± 0.55 ms	1.02
eval/Float64/derivative_turbo	14.5 ± 0.51 ms	14.3 ± 0.5 ms	1.01
eval/Float64/evaluation	3.16 ± 0.3 ms	3.18 ± 0.31 ms	0.994
eval/Float64/evaluation_bumper	1.18 ± 0.043 ms	1.17 ± 0.043 ms	1
eval/Float64/evaluation_turbo	1.02 ± 0.068 ms	0.998 ± 0.064 ms	1.02
eval/Float64/evaluation_turbo_bumper	1.18 ± 0.041 ms	1.18 ± 0.045 ms	1
utils/combine_operators/break_sharing	0.0388 ± 0.00055 ms	0.0387 ± 0.00053 ms	1
utils/convert/break_sharing	27.3 ± 2.8 μs	26.2 ± 2.6 μs	1.04
utils/convert/preserve_sharing	0.0976 ± 0.0043 ms	0.0977 ± 0.0038 ms	0.999
utils/copy/break_sharing	26.8 ± 2.8 μs	27.2 ± 2.7 μs	0.985
utils/copy/preserve_sharing	0.0979 ± 0.0039 ms	0.0986 ± 0.0037 ms	0.992
utils/count_constant_nodes/break_sharing	8.84 ± 0.2 μs	8.89 ± 0.19 μs	0.994
utils/count_constant_nodes/preserve_sharing	0.0855 ± 0.0033 ms	0.0855 ± 0.003 ms	1
utils/count_depth/break_sharing	9.54 ± 0.2 μs	9.63 ± 0.18 μs	0.991
utils/count_nodes/break_sharing	8.19 ± 0.19 μs	8.4 ± 0.14 μs	0.974
utils/count_nodes/preserve_sharing	0.0843 ± 0.0034 ms	0.0856 ± 0.0033 ms	0.986
utils/get_set_constants!/break_sharing	0.0337 ± 0.0021 ms	0.0327 ± 0.0017 ms	1.03
utils/get_set_constants!/preserve_sharing	0.175 ± 0.0055 ms	0.177 ± 0.0054 ms	0.992
utils/get_set_constants_parametric	0.0448 ± 0.0022 ms	0.0461 ± 0.0023 ms	0.972
utils/has_constants/break_sharing	4.02 ± 0.08 μs	4.07 ± 0.11 μs	0.988
utils/has_operators/break_sharing	2.51 ± 0.045 μs	2 ± 0.045 μs	1.25
utils/hash/break_sharing	22.9 ± 0.55 μs	22.7 ± 0.73 μs	1.01
utils/hash/preserve_sharing	0.0967 ± 0.0035 ms	0.0974 ± 0.0035 ms	0.992
utils/index_constant_nodes/break_sharing	25.2 ± 1 μs	24.7 ± 1.1 μs	1.02
utils/index_constant_nodes/preserve_sharing	0.098 ± 0.0039 ms	0.0986 ± 0.0034 ms	0.994
utils/is_constant/break_sharing	4.6 ± 0.076 μs	4.47 ± 0.12 μs	1.03
utils/simplify_tree/break_sharing	0.177 ± 0.0041 ms	0.18 ± 0.003 ms	0.984
utils/simplify_tree/preserve_sharing	0.233 ± 0.0051 ms	0.234 ± 0.0056 ms	0.995
utils/string_tree/break_sharing	0.463 ± 0.014 ms	0.472 ± 0.015 ms	0.981
utils/string_tree/preserve_sharing	0.566 ± 0.017 ms	0.582 ± 0.02 ms	0.973
time_to_load	0.202 ± 0.0036 s	0.204 ± 0.0019 s	0.994