Add support for Lambda discard parameters#995

RexJaeschke wants to merge 3 commits into

dotnet:draft-v9dotnet/csharpstandard:draft-v9from

RexJaeschke:Add-support-for-Lambda-discard-parametersRexJaeschke/csharpstandard:Add-support-for-Lambda-discard-parametersCopy head branch name to clipboard