std.hash_map: workaround for circular dependency

See #11367

It's debatable whether this ends up being a legitimate compile error or
whether the lang spec allows this test case. For now this workaround
seems very reasonable; delaying comptime execution of `verifyContext`
until the struct is instantiated.
b45c6c757cAndrew Kelley committed on 4/1/2022, 7:17:02 AMparent26253ac
1 file changedLine totals unavailable