block-information

Arguments: name &optional env

This function returns information about the block named by name in the environment env. env may an environment object or nil, indicating the null lexical environment.

Three values are returned: :block, a locative, and declaration list. The car of the locative is a catch tag (usually a unique cons cell) and the cdr of the locative is nil as long as the block is within scope. As part of the cleanup when the block is exiting, the cdr of the block's locative is set to 'invalid, which marks the block as being no longer in scope.

See environments.htm for more information on environments.

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This page was not revised from the 10.0 page.
Created 2019.8.20.