Call report_internal_error() in wrap_context(), as a catch-all (no line number available).

Fixes #1341 good.

Author: Guido van Rossum

mypy/build.py

@@ -28,7 +28,7 @@
                         SymbolTableNode, MODULE_REF)
 from mypy.semanal import FirstPass, SemanticAnalyzer, ThirdPass
 from mypy.checker import TypeChecker
-from mypy.errors import Errors, CompileError
+from mypy.errors import Errors, CompileError, report_internal_error
 from mypy import fixup
 from mypy.report import Reports
 from mypy import defaults
@@ -1036,7 +1036,12 @@ def check_blockers(self) -> None:
     def wrap_context(self) -> Iterator[None]:
         save_import_context = self.manager.errors.import_context()
         self.manager.errors.set_import_context(self.import_context)
-        yield
+        try:
+            yield
+        except CompileError:
+            raise
+        except Exception as err:
+            report_internal_error(err, self.path, 0)
         self.manager.errors.set_import_context(save_import_context)
         self.check_blockers()
 

mypy/errors.py

@@ -377,8 +377,12 @@ def report_internal_error(err: Exception, file: str, line: int) -> None:
         print(s.rstrip('\n'))
     print('{}: {}'.format(type(err).__name__, err))
     print('\n*** INTERNAL ERROR ***', file=sys.stderr)
-    print('\n{}:{}: error: Internal error --'.format(file, line),
-          'please report a bug at https://github.com/JukkaL/mypy/issues',
+    if line:
+        prefix = '{}:{}'.format(file, line)
+    else:
+        prefix = file
+    print('\n{}: error: Internal error --'.format(prefix),
+          'please report a bug at https://github.com/python/mypy/issues',
           file=sys.stderr)
     print('\nNOTE: you can use "mypy --pdb ..." to drop into the debugger when this happens.',
           file=sys.stderr)