test: mark some uncovered things

3 files changed, 12 insertions, 3 deletions

diff --git a/coverage/cmdline.py b/coverage/cmdline.py
index 1fa52a97..eae22f2f 100644
--- a/coverage/cmdline.py
+++ b/coverage/cmdline.py
@@ -646,6 +646,9 @@ class CoverageScript:
                 show_contexts=options.show_contexts,
                 **report_args
             )
+        else:
+            # There are no other possible actions.
+            raise AssertionError
 
         if total is not None:
             # Apply the command line fail-under options, and then use the config
diff --git a/coverage/misc.py b/coverage/misc.py
index 0f985be0..30b75744 100644
--- a/coverage/misc.py
+++ b/coverage/misc.py
@@ -329,10 +329,12 @@ def substitute_variables(text, variables):
         )
         """
 
+    dollar_groups = ('dollar', 'word1', 'word2')
+
     def dollar_replace(match):
         """Called for each $replacement."""
         # Only one of the groups will have matched, just get its text.
-        word = next(g for g in match.group('dollar', 'word1', 'word2') if g)
+        word = next(g for g in match.group(*dollar_groups) if g)    # pragma: always breaks
         if word == "$":
             return "$"
         elif word in variables:
diff --git a/coverage/parser.py b/coverage/parser.py
index 8792d0ac..5c467a7e 100644
--- a/coverage/parser.py
+++ b/coverage/parser.py
@@ -437,11 +437,15 @@ class BlockBase:
     # pylint: disable=unused-argument
     def process_break_exits(self, exits, add_arc):
         """Process break exits."""
-        return False
+        # Because break can only appear in loops, and most subclasses
+        # implement process_break_exits, this function is never reached.
+        raise AssertionError
 
     def process_continue_exits(self, exits, add_arc):
         """Process continue exits."""
-        return False
+        # Because continue can only appear in loops, and most subclasses
+        # implement process_continue_exits, this function is never reached.
+        raise AssertionError
 
     def process_raise_exits(self, exits, add_arc):
         """Process raise exits."""