The construct '@\{-<n>\}' means the <n>th branch checked out
before the current one.
-'<refname>@\{upstream\}', e.g. 'master@\{upstream\}', '@\{u\}'::
- The suffix '@\{upstream\}' to a ref (short form '<refname>@\{u\}') refers to
- the branch the ref is set to build on top of. A missing ref defaults
- to the current branch.
+'<branchname>@\{upstream\}', e.g. 'master@\{upstream\}', '@\{u\}'::
+ The suffix '@\{upstream\}' to a branchname (short form '<branchname>@\{u\}')
+ refers to the branch that the branch specified by branchname is set to build on
+ top of. A missing branchname defaults to the current one.
'<rev>{caret}', e.g. 'HEAD{caret}, v1.5.1{caret}0'::
A suffix '{caret}' to a revision parameter means the first parent of