class

ReadonlyErr

const class ReadonlyErr : Err

ReadonlyErr indicates an attempt to modify a readonly instance. It is commonly used with List and Map.

 constructors make

Construct with specified error message and optional root cause

 make new make(Str msg, Err? cause)

Construct with specified error message and optional root cause.

 Haxall 4.0.5 ∙ 24-Feb-2026 14:33 EST