Fail gracefully when line number is out-of-bounds and negative

AUTHORS

@@ -163,6 +163,7 @@ Ionuț Turturică
 Itxaso Aizpurua
 Iwan Briquemont
 Jaap Broekhuizen
+Jake VanderPlas
 Jakob van Santen
 Jakub Mitoraj
 James Bourbeau

src/_pytest/_code/code.py

@@ -743,7 +743,7 @@ class FormattedExcinfo:
     ) -> List[str]:
         """Return formatted and marked up source lines."""
         lines = []
-        if source is None or line_index >= len(source.lines):
+        if source is None or line_index >= len(source.lines) or line_index < -len(source.lines):
             source = Source("???")
             line_index = 0
         if line_index < 0:

testing/code/test_excinfo.py

@@ -461,6 +461,24 @@ class TestFormattedExcinfo:
         assert lines[0] == "|   def f(x):"
         assert lines[1] == "        pass"
 
+    def test_repr_source_out_of_bounds(self):
+        pr = FormattedExcinfo()
+        source = _pytest._code.Source(
+            """\
+            def f(x):
+                pass
+            """
+        ).strip()
+        pr.flow_marker = "|"  # type: ignore[misc]
+
+        lines = pr.get_source(source, 100)
+        assert len(lines) == 1
+        assert lines[0] == "|   ???"
+
+        lines = pr.get_source(source, -100)
+        assert len(lines) == 1
+        assert lines[0] == "|   ???"
+
     def test_repr_source_excinfo(self) -> None:
         """Check if indentation is right."""
         try: