Looks like that was added about 3 years after I wrote my test code.
According to the docs there, it was stabilized in 1.0, then stabilized in const contexts in 1.32. Were you testing this in 2012?
alt Hacker News
According to the docs there, it was stabilized in 1.0, then stabilized in const contexts in 1.32. Were you testing this in 2012?