class RuntimeError

Parent:
StandardError

A generic error class raised when an invalid operation is attempted.

[1, 2, 3].freeze << 4

raises the exception:

RuntimeError: can't modify frozen Array

Kernel#raise will raise a RuntimeError if no Exception class is specified.

raise "ouch"

raises the exception:

RuntimeError: ouch

Ruby Core © 1993–2017 Yukihiro Matsumoto
Licensed under the Ruby License.
Ruby Standard Library © contributors
Licensed under their own licenses.