Complex

Strings

str is the heap-backed UTF-8 string type. It requires the memo capability model; a memo artifact with bundled std remains heap-capable. It is not available in core.

var label: str = "fol";

Number

num is a planned abstraction over integer and floating-point types. It is not part of the current compiler surface. Imaginary-number support is likewise outside the active stream, lexer, parser, and lowering contract.

Pointers

V3 ships typed unique and shared pointers:

var[mut] unique: ptr[int] = [ref]value;
var shared: ptr[shared, int] = [ref]value;

ptr[T] is uniquely owned and writable through a mutable pointer binding. ptr[shared, T] is reference-counted and read-only. Pointer types can be analyzed in core, but [ref]value constructs an allocation and therefore requires memo. A memo artifact may additionally declare bundled std, but the pointer operation itself does not require hosted APIs. Raw ptr[raw, T] remains a V4 interop boundary.

See Pointers for transfer, dereference, shared recursion, and current place-projection rules.

Error shells

err[T] is the storable error shell:

var failure: err[str] = "not found";

It is distinct from a routine’s recoverable : Result / Error contract. See Recoverable Errors for that boundary.