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-rw-r--r--docs/users_guide/flags.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/docs/users_guide/flags.py b/docs/users_guide/flags.py
index 90d6921827..dcc6743d18 100644
--- a/docs/users_guide/flags.py
+++ b/docs/users_guide/flags.py
@@ -602,7 +602,7 @@ def process_print_nodes(app, doctree, fromdocname):
node.generate_output(app, fromdocname)
# Write out file listing all documented flags
- with open(os.path.join(app.outdir, 'ghc-flags.txt'), 'w') as f:
+ with open(os.path.join(app.outdir, 'ghc-flags.txt'), 'w', encoding='utf-8') as f:
flag_names = \
{name
for flag in app.env.all_flags