':/<oneline prefix>' notation doesn't support full file syntax

["Eric Raible" <raible@xxxxxxxxx>]

Although the rev-parse documentation claims that the
tree-ish:path/to/file syntax works is applicable, this is
not so when using the :/ "oneline prefix" syntax:

% git rev-parse v1.5.0.1-227-g28a4d94
28a4d940443806412effa246ecc7768a21553ec7
% git rev-parse ":/object name"
28a4d940443806412effa246ecc7768a21553ec7

% git rev-parse v1.5.0.1-227-g28a4d94:sha1_name.c
0781477a71ac4d76a1b8783868d6649cae7f8507
% git rev-parse ":/object name":sha1_name.c
:/object name:sha1_name.c
fatal: ambiguous argument ':/object name:sha1_name.c': unknown
revision or path not in the working tree.
Use '--' to separate paths from revisions

A quick look at int sha1_name.c:get_sha1() shows that it doesn't
even try to make this work.  Is this worth fixing?
Or at least documenting?

- Eric
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