Ludovic Courtès 41766807d0 ui: Improve error reporting for 'read/eval'.
The effect is visible on commands like:

  guix build -e '(+ 2 "foo")'
  guix build -e '()'

* guix/ui.scm (read/eval): Change handler to properly report syntax errors and
  use 'display-error' for other errors.
2015-05-26 22:38:17 +02:00
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