term∃!__,_ — Mathlib

Lean4
/-- `∃! x ∈ s, p x` means `∃! x, x ∈ s ∧ p x`, which is to say that there exists a unique `x ∈ s`
such that `p x`.
Similarly, notations such as `∃! x ≤ n, p n` are supported,
using any relation defined using the `binder_predicate` command.
-/
@[term_parser 1000]
public meta def «term∃!__,_» : Lean.ParserDescr✝ :=
  ParserDescr.node✝ `Mathlib.Notation.«term∃!__,_» 1022
    (ParserDescr.binary✝ `andthen
      (ParserDescr.binary✝ `andthen
        (ParserDescr.binary✝ `andthen (ParserDescr.binary✝ `andthen (ParserDescr.symbol✝ "∃! ") Lean.binderIdent)
          (ParserDescr.cat✝ `binderPred 0))
        (ParserDescr.symbol✝ ", "))
      (ParserDescr.cat✝ `term 0))
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