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Return syntax `Prod.mk elems[0] (Prod.mk elems[1] ... (Prod.mk elems[elems.size - 2] elems[elems.size - 1])))`

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- Lean.Elab.Term.mkPairs elems = Lean.Elab.Term.mkPairs.loop elems (elems.size - 1) elems.back

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Return `some`

if succeeded expanding `·`

notation occurring in
the given syntax. Otherwise, return `none`

.
Examples:

`· + 1`

=>`fun _a_1 => _a_1 + 1`

`f · · b`

=>`fun _a_1 _a_2 => f _a_1 _a_2 b`

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Auxiliary function for expanding the `·`

notation.
The extra state `Array Syntax`

contains the new binder names.
If `stx`

is a `·`

, we create a fresh identifier, store in the
extra state, and return it. Otherwise, we just return `stx`

.

Helper method for elaborating terms such as `(.+.)`

where a constant name is expected.
This method is usually used to implement tactics that take function names as arguments
(e.g., `simp`

).

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- Lean.Elab.Term.elabNoindex stx expectedType? = do let e ← Lean.Elab.Term.elabTerm stx[1] expectedType? true pure (Lean.Meta.DiscrTree.mkNoindexAnnotation e)

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Elaborator for `by_elab`

.

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