TreeEntry.xs: WIP: C89, define variables on entering scope
Blob.xs: Introduce scope
Branch.xs: Introduce scope
Commit.xs: Introduce scope
Config.xs: Introduce scope
Cred.xs: Introduce scope
Diff.xs: Introduce scope
Index.xs: Introduce scope
Push.xs: Introduce scope
Reference.xs: Introduce scope
Walker.xs: Introduce scope
TreeEntry.xs: Introduce scope
TreeBuilder.xs: Introduce scope
Tree.xs: Introduce scope
Tag.xs: Introduce scope
Remote.xs: Introduce scope