temp: show information about the lcov file failing. #1553nedbat/debug-1553

1 files changed, 9 insertions, 1 deletions

diff --git a/coverage/lcovreport.py b/coverage/lcovreport.py
index b9fe2568..37e03b05 100644
--- a/coverage/lcovreport.py
+++ b/coverage/lcovreport.py
@@ -68,7 +68,15 @@ class LcovReporter:
             # characters of the encoding ("==") are removed from the hash to
             # allow genhtml to run on the resulting lcov file.
             if source_lines:
-                line = source_lines[covered-1].encode("utf-8")
+                try:
+                    line = source_lines[covered-1].encode("utf-8")
+                except:
+                    print(f"Failure processing {fr.filename!r}:")
+                    with open(fr.filename) as f:
+                        print("=" * 80)
+                        print(f.read())
+                        print("=" * 80)
+                    raise
             else:
                 line = b""
             hashed = base64.b64encode(md5(line).digest()).decode().rstrip("=")