defined() — internals

defined() — internals

Where it lives

• Signature: src/builtins/system/defined.rs
• Lowering: src/codegen/lower_inst/builtins.rs:553 (lower_defined)
• Function symbol: lower_defined()

Lowering notes

• Lowers defined("NAME") for compile-time string constant names.

Runtime helpers

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

Signature summary

function defined(string $constant_name): bool

What the type checker enforces

• Arity: takes exactly 1 argument.

Eval interpreter (magician)

• Declaration: crates/elephc-magician/src/interpreter/builtins/core/defined.rs (eval_builtin!)
• Dispatch hooks: direct, values

Cross-references

• User reference for defined()