I want to export a subtree of a file, but that subtree has links to
headings in the file that are outside of the subtree. I expect the
exporting process to produce some sort of valid result, but instead it
throws an "Unable to resolve link" error. Here's a test file to
reproduce:

* Foo
* Bar :export:
[[*Foo][Foo]]

Making a file with those contents and trying to export it to e.g.
latex will fail, but if the :export: tag is removed, exporting
succeeds. I can't easily get a backtrace because the error comes from
user-error, but it happens in org-export-resolve-fuzzy-link.

Of course the exported file can't link to a target that doesn't exist,
but it's probably better to strip out the link in this case than to
throw an error, right?

Emacs  : GNU Emacs 24.4.1 (x86_64-apple-darwin13.4.0, NS
apple-appkit-1265.21)
 of 2014-10-20 on builder10-9.porkrind.org
Package: Org-mode version 8.3.1 (8.3.1-95-g1dbb25-elpa)

current state:
==============
(setq
 org-tab-first-hook '(org-hide-block-toggle-maybe
     org-babel-hide-result-toggle-maybe
     org-babel-header-arg-expand)
 org-speed-command-hook '(org-speed-command-default-hook
 org-babel-speed-command-hook)
 org-occur-hook '(org-first-headline-recenter)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-html-format-drawer-function '(lambda (name contents) contents)
 org-latex-format-inlinetask-function
'org-latex-format-inlinetask-default-function
 org-confirm-shell-link-function 'yes-or-no-p
 org-ascii-format-inlinetask-function 'org-ascii-format-inlinetask-default
 org-latex-format-headline-function
'org-latex-format-headline-default-function
 org-after-todo-state-change-hook '(org-clock-out-if-current)
 org-latex-format-drawer-function '(lambda (name contents) contents)
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
    org-src-mode-configure-edit-buffer)
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-babel-pre-tangle-hook '(save-buffer)
 org-mode-hook '(#[nil "\300\301\302\303\304$\207"
  [org-add-hook change-major-mode-hook org-show-block-all
   append local]
  5]
#[nil "\300\301\302\303\304$\207"
  [org-add-hook change-major-mode-hook
   org-babel-show-result-all append local]
  5]
org-babel-result-hide-spec org-babel-hide-all-hashes)
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-ascii-format-drawer-function '(lambda (name contents width) contents)
 org-ctrl-c-ctrl-c-hook '(org-babel-hash-at-point
 org-babel-execute-safely-maybe)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers
 org-cycle-show-empty-lines
 org-optimize-window-after-visibility-change)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-html-format-headline-function
'org-html-format-headline-default-function
 org-html-format-inlinetask-function
'org-html-format-inlinetask-default-function
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 )