array_udiff() — internals

array_udiff() — internals

Where it lives

• Signature: src/builtins/array/array_udiff.rs
• Lowering: src/codegen/lower_inst/builtins/arrays.rs:1703 (lower_array_udiff)
• Function symbol: lower_array_udiff()

Lowering notes

• Lowers array_udiff(): keeps first-array elements not equal (per comparator) to any second-array element.

Runtime helpers

No direct __rt_* helpers captured — the lowering is inlined or routes through another builtin.

Signature summary

function array_udiff(array $array1, array $array2, callable $callback): array

What the type checker enforces

• Arity: takes exactly 3 arguments.

Eval interpreter (magician)

Not callable from eval’d code — the magician interpreter has no entry for this builtin.

Cross-references

• User reference for array_udiff()