Martin von Zweigbergk <martinvonz@google.com> [Thu, 21 Jun 2018 22:07:34 -0700] rev 39945
copies: inline a variable that's used only once
By inlining it, we also avoid calculating the value when "if of in
seen" is false (probably not significant).
Differential Revision: https://phab.mercurial-scm.org/D4831