built-in method

instantiation_error/0

Description

instantiation_error

Throws an instantiation error. Used when an argument or one of its sub-arguments is a variable but a non-variable term is required. For example, trying to open a file with a variable for the input/output mode.

This built-in method is declared private and thus cannot be used as a message to an object. Calling this predicate is equivalent to the following sequence of calls:

...,
context(Context),
throw(error(instantiation_error, Context)).

This allows the user to generate errors in the same format used by the runtime.

Modes and number of proofs

instantiation_error - error

Errors

When called:
instantiation_error

Examples

...,
var(Handler),
instantiation_error.

See also

catch/3, throw/1, context/1, uninstantiation_error/1, type_error/2, domain_error/2, consistency_error/3, existence_error/2, permission_error/3, representation_error/1, evaluation_error/1, resource_error/1, syntax_error/1, system_error/0