https://github.com/dotnet/corefx/blob/master/src/System.ValueTuple/src/System/ValueTuple/ValueTuple.cs#L446
Change "first" to "second".
Do you want to create a Pull Request that fixes it?
It's fairly simple: start by clicking on the pencil icon at the top of the file.
Here are docs (under construction) for first PR: https://github.com/dotnet/corefx/wiki/New-contributor-Docs#contributing-guide
Fixed in dotnet/corefx#20090
Most helpful comment
Do you want to create a Pull Request that fixes it?
It's fairly simple: start by clicking on the pencil icon at the top of the file.