error on bool arg w/ char pres_type (#3734)

fmtlib · Dec 5, 2023 · 573d743 · 573d743
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commit 573d743
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diff --git a/include/fmt/core.h b/include/fmt/core.h
@@ -2429,6 +2429,7 @@ FMT_CONSTEXPR FMT_INLINE auto parse_format_specs(
     case 'G':
       return parse_presentation_type(pres::general_upper, float_set);
     case 'c':
+      if (arg_type == type::bool_type) throw_format_error("invalid format specifier");
       return parse_presentation_type(pres::chr, integral_set);
     case 's':
       return parse_presentation_type(pres::string,

diff --git a/test/format-test.cc b/test/format-test.cc
@@ -1159,6 +1159,8 @@ TEST(format_test, format_bool) {
   EXPECT_EQ("true", fmt::format("{:s}", true));
   EXPECT_EQ("false", fmt::format("{:s}", false));
   EXPECT_EQ("false ", fmt::format("{:6s}", false));
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:c}"), false), format_error,
+                   "invalid format specifier");
 }
 
 TEST(format_test, format_short) {