Documentation

Lean.Elab.BuiltinTerm

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    the method resolveName adds a completion point for it using the given expected type. Thus, we propagate the expected type if stx[0] is an identifier. It doesn't "hurt" if the identifier can be resolved because the expected type is not used in this case. Recall that if the name resolution fails a synthetic sorry is returned.

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                      Returns true if stx is a by expression with an empty tactic body (not a parse error producing .missing). The structure is: node byTactic [atom "by", node tacticSeq [node tacticSeq1Indented [node null []]]]

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                        Returns true if all conditions are met for empty by to be elaborated as try?: the body is empty, the option is enabled, we are in an interactive (non-combinator) context, and the try? infrastructure (parser Lean.Parser.Tactic.tryTrace) is available — the latter matters when working on the prelude, before Init.Try is imported.

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                          Body of the byTactic term elaborator: registers a tactic mvar for the body, or errors when there's no expected type. Shared between elabByTactic and Lean.Elab.Tactic.Try's elabEmptyByAsTry so the two paths can't drift.

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