Fix (not) handling exceptions when creating processes

CHANGELOG.rst

@@ -24,6 +24,12 @@ Changed
   ``timeout`` parameter is still accepted, but will add a
   ``DeprecationWarning`` and will be removed in future versions.
 
+Fixed
+^^^^^
+
+- Fix problem where some exceptions when creating processes where hidden and
+  would then cause errors where the ``proc`` variable did not exist.
+
 0.9.0_ - 2023-04-04
 -------------------
 

src/minizinc/instance.py

@@ -381,9 +381,9 @@ async def solutions(
             # Whether the status has changed since the last `yield`
             status_changed = False
 
+            # Run the MiniZinc process
+            proc = await self._driver._create_process(cmd, solver=solver)
             try:
-                # Run the MiniZinc process
-                proc = await self._driver._create_process(cmd, solver=solver)
                 assert isinstance(proc.stderr, asyncio.StreamReader)
                 assert isinstance(proc.stdout, asyncio.StreamReader)