declare_config_elab elabName TypeName declares a function elabName : Syntax → TacticM TypeName
that elaborates a tactic configuration.
The tactic configuration can be from Lean.Parser.Tactic.optConfig or Lean.Parser.Tactic.config,
and these can also be wrapped in null nodes (for example, from (config)?).
The elaborator responds to the current recovery state.
For defining elaborators for commands, use declare_command_config_elab.
declare_command_config_elab elabName TypeName declares a function elabName : Syntax → CommandElabM TypeName
that elaborates a command configuration.
The configuration can be from Lean.Parser.Tactic.optConfig or Lean.Parser.Tactic.config,
and these can also be wrapped in null nodes (for example, from (config)?).
The elaborator has error recovery enabled.