Module error 

CommandError: why a grammar invocation produced no effect.

Every evaluator (motion, operator, text object, ex-command, action) and the dispatcher itself return GrammarResult. The contract shared by all variants: an Err commits nothing. The dispatcher returns before any crate::Effect reaches the host, so the document, cursor, undo stack and registers are exactly as they were when the keystroke arrived. Variants differ only in what the host does besides dropping the invocation – most are logged, CommandError::User is echoed to the user, CommandError::MotionFailed is vim’s silent beep.

Enums

CommandError

Why a grammar invocation failed. See the module docs for the no-effect-on-error contract every variant shares.

Type Aliases

GrammarResult

Result alias used by every evaluator and by the dispatcher.