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Support length on arrays of any element type - #357
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Fixes #355. The builtin length was declared for int[] only, so .length of any other array (String[], Object[], ...) in the context made every Z3 query fail with a sort mismatch. length now gets one overload per array sort, declared on first use. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Fixes #355.
Problem
The builtin
lengthwas declared as(declare-fun length ((Array Int Int)) Int), forint[]only. Any other array's.lengthin the context (afor (int i = 0; i < names.length; i++)loop over aString[]) made every Z3 query in that scope crash withSort mismatch at argument #1 for function (declare-fun length ((Array Int Int)) Int) supplied sort is |java.lang.String[]|.Change
TranslatorToZ3.makeFunctionInvocationrouteslengthtomakeLength, which uses the builtin declaration forint[]and otherwise declares (once per sort, cached) alengthoverload whose domain is the array's sort.Tests
CorrectStringArrayLength: a loop bounded bynames.lengthover a refinedString[], pluslength(names) > 0flowing into_ > 0; crashed on main, now passes.ErrorStringArrayLength:length(names) >= 0does not give_ > 0; crashed on main, now the Refinement Error.mvn testpasses.🤖 Generated with Claude Code