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-rw-r--r--sphinx/pycode/pgen2/driver.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/sphinx/pycode/pgen2/driver.py b/sphinx/pycode/pgen2/driver.py
index e9e907dc..422671db 100644
--- a/sphinx/pycode/pgen2/driver.py
+++ b/sphinx/pycode/pgen2/driver.py
@@ -122,7 +122,8 @@ def load_grammar(gt="Grammar.txt", gp=None,
if tail == ".txt":
tail = ""
# embed Sphinx major version for the case we ever change the grammar...
- gp = head + tail + ".".join(map(str, sphinx.version_info[:2])) + ".pickle"
+ gp = head + tail + "-sphinx" + \
+ ".".join(map(str, sphinx.version_info[:2])) + ".pickle"
if force or not _newer(gp, gt):
logger.info("Generating grammar tables from %s", gt)
g = pgen.generate_grammar(gt)