[Accepted at the November, 2020 meeting as part of paper P1787R6 and moved to DR at the February, 2021 meeting.]

According to 7.5.5 [expr.prim.lambda] paragraph 7, names appearing in the compound-statement of a lambda-expression are looked up in the context of the lambda-expression, ignoring the fact that the compound-statement will be transformed into the body of the closure type's function operator. This leaves unspecified how the lambda-expression's parameters are found by name lookup. Presumably the parameters hide the corresponding names from the surrounding scope, but this needs to be specified.