Lua.VM.ArgumentError exception (Lua v1.0.0-rc.1)

Raised when a function is called with invalid arguments.

This exception provides standardized error messages for bad arguments across all Lua standard library functions.

Fields

:function_name - The fully qualified function name (e.g., "string.rep")
:arg_num - The argument number (1-based)
:expected - What type or value was expected (e.g., "number", "string")
:got - What was actually received (optional, e.g., "nil", "boolean")
:details - Additional details about the error (optional)
:line - Source line where the call originated (auto-populated from Lua.VM.Executor.current_position/0 when not given explicitly)
:source - Source name where the call originated (auto-populated)
:call_stack - Call stack frames at the raise site (default [])

Examples

# Basic type error — line/source filled in automatically when raised
# from inside a Lua execution.
raise ArgumentError,
  function_name: "string.rep",
  arg_num: 2,
  expected: "number"

# With actual type received
raise ArgumentError,
  function_name: "string.sub",
  arg_num: 2,
  expected: "number",
  got: "string"

# With additional details
raise ArgumentError,
  function_name: "string.char",
  arg_num: 1,
  expected: "number",
  details: "value out of range"

Summary

Functions

type_error(function_name, arg_num, expected, got)

Creates an ArgumentError for type mismatches.

value_expected(function_name, arg_num)

Creates an ArgumentError when no value is provided for a required argument.

wrong_number_of_arguments(function_name)

Builds the PUC-Lua "wrong number of arguments to 'X'" runtime error.

Types

t()

@type t() :: %Lua.VM.ArgumentError{
  __exception__: true,
  arg_num: term(),
  call_stack: term(),
  details: term(),
  expected: term(),
  function_name: term(),
  got: term(),
  line: term(),
  source: term()
}