[Bugfix] Add missing f-string prefix in xgrammar choices error message (#38162)

Signed-off-by: Yifan Zong <yzong@redhat.com>

[Bugfix] Add missing f-string prefix in xgrammar choices error message (#38162)
Signed-off-by: Yifan Zong <yzong@redhat.com>
28048bd6 · yzong-rh · GitHub · c32e9760 · 28048bd6
Unverified Commit 28048bd6 authored Mar 26, 2026 by yzong-rh Committed by GitHub Mar 26, 2026
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vllm/v1/structured_output/backend_xgrammar.py vllm/v1/structured_output/backend_xgrammar.py +1 -1

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--- a/vllm/v1/structured_output/backend_xgrammar.py
+++ b/vllm/v1/structured_output/backend_xgrammar.py
@@ -289,7 +289,7 @@ def validate_xgrammar_grammar(sampling_params: SamplingParams) -> None:
            xgr.Grammar.from_ebnf(choice_grammar)
        except Exception as err:
            raise ValueError(
-                "Failed to transform choices into a grammar: {err}"
+                f"Failed to transform choices into a grammar: {err}"
            ) from err
        so_params.choice = None
        so_params.grammar = choice_grammar