Fix asan error (#977)

de71db6d · Victor Zverovich · b180b391 · de71db6d
Commit de71db6d authored Dec 12, 2018 by Victor Zverovich
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include/fmt/format.h include/fmt/format.h +2 -2

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--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -1952,8 +1952,8 @@ FMT_CONSTEXPR const Char *parse_arg_id(
    return handler.on_error("invalid format string"), begin;
  auto it = begin;
  do {
-    c = *++it;
-  } while (it != end && (is_name_start(c) || ('0' <= c && c <= '9')));
+    ++it;
+  } while (it != end && (is_name_start(c = *it) || ('0' <= c && c <= '9')));
  handler(basic_string_view<Char>(begin, to_unsigned(it - begin)));
  return it;
 }