chat : fix LFM2 tool call arg name prefix ambiguity (#26960)

Assisted-by: Claude Opus 5

diff --git a/common/chat-peg-parser.cpp b/common/chat-peg-parser.cpp
index 1910b4f1e13553f660fd6f6506ab1d601f09ffbd..06737b165c058d90159e1fc0369538b7d6a404e9 100644 (file)
--- a/common/chat-peg-parser.cpp
+++ b/common/chat-peg-parser.cpp
@@ -594,9 +594,7 @@ common_peg_parser common_chat_peg_builder::python_style_tool_calls(
 
                 // Full argument: name="value" or name=value
                 auto arg_rule = tool_arg(
-                    tool_arg_open(eps()) +
-                    tool_arg_name(arg_name_parser) +
-                    literal("=") +
+                    tool_arg_open(tool_arg_name(arg_name_parser) + literal("=")) +
                     arg_value_parser +
                     tool_arg_close(eps())
                 );