diff options
Diffstat (limited to 'lib/syntax_tools/src/merl_transform.erl')
| -rw-r--r-- | lib/syntax_tools/src/merl_transform.erl | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/lib/syntax_tools/src/merl_transform.erl b/lib/syntax_tools/src/merl_transform.erl index fe58b6a122..b298bc407f 100644 --- a/lib/syntax_tools/src/merl_transform.erl +++ b/lib/syntax_tools/src/merl_transform.erl @@ -9,6 +9,16 @@ %% See the License for the specific language governing permissions and %% limitations under the License. %% +%% Alternatively, you may use this file under the terms of the GNU Lesser +%% General Public License (the "LGPL") as published by the Free Software +%% Foundation; either version 2.1, or (at your option) any later version. +%% If you wish to allow use of your version of this file only under the +%% terms of the LGPL, you should delete the provisions above and replace +%% them with the notice and other provisions required by the LGPL; see +%% <http://www.gnu.org/licenses/>. If you do not delete the provisions +%% above, a recipient may use your version of this file under the terms of +%% either the Apache License or the LGPL. +%% %% @author Richard Carlsson <[email protected]> %% @copyright 2012-2015 Richard Carlsson %% @doc Parse transform for merl. Enables the use of automatic metavariables @@ -104,10 +114,15 @@ expand_qquote([Text, Env], T, Line) -> case erl_syntax:is_literal(Text) of true -> As = [Line, erl_syntax:concrete(Text)], - %% expand further if possible - expand(merl:qquote(Line, "merl:subst(_@tree, _@env)", - [{tree, eval_call(Line, quote, As, T)}, - {env, Env}])); + case eval_call(Line, quote, As, failed) of + failed -> + T; + T1 -> + %% expand further if possible + expand(merl:qquote(Line, "merl:subst(_@tree, _@env)", + [{tree, T1}, + {env, Env}])) + end; false -> T end; |