Guard the null value of a value-initialized iterator; drop the unneeded found flag

With the root's byte range, diagnostics() reaches get_byte_positions() also
with JSON_DIAGNOSTICS when there is no value, as for a value-initialized
iterator (invalid_iterator.212). get_byte_positions() now returns no range
for a null value, the same change as #6003, so either can be merged first.

In the view, a value that value_path() does not find leaves no tokens, so the
found flag added nothing to the tokens.empty() test.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

docs/mkdocs/docs/api/basic_json/get.md

@@ -120,16 +120,6 @@ overload (3).
     See [Number conversion](../../features/types/number_handling.md#number-conversion)
     for more information.
 
-!!! note "Booleans as numbers"
-
-    A JSON boolean converts to `#!cpp 0` or `#!cpp 1` for every arithmetic type **except** [`number_integer_t`](number_integer_t.md),
-    [`number_unsigned_t`](number_unsigned_t.md) and [`number_float_t`](number_float_t.md) (by default `#!cpp std::int64_t`,
-    `#!cpp std::uint64_t`, and `#!cpp double`), for which `#!cpp get<T>()` throws
-    [`type_error.302`](../../home/exceptions.md#jsonexceptiontype_error302) ("type must be number, but is boolean"). So
-    `#!cpp json(true).get<int>()` is `#!cpp 1`, while `#!cpp json(true).get<std::int64_t>()` and
-    `#!cpp json(true).get<double>()` throw. This is the behavior of all 3.x versions;
-    [`basic_json_view::get<T>()`](../basic_json_view/get.md) behaves the same.
-
 !!! note "`std::optional` conversions"
 
     Prior to version 3.13.0, `#!cpp get<std::optional<T>>()` (and other conversions to `std::optional<T>`) failed to

docs/mkdocs/docs/api/basic_json_view/get.md

@@ -11,8 +11,7 @@ For the types below, the conversion works directly on the flat index — no `Bas
 
 - `#!cpp bool`
 - arithmetic types other than `#!cpp bool` (for a boolean, `#!cpp 0`/`#!cpp 1`, exactly as for
-  [`BasicJsonType::get<T>()`](../basic_json/get.md#notes), except for `number_integer_t`, `number_unsigned_t` and
-  `number_float_t`, which throw `type_error.302` for a boolean, as `BasicJsonType::get<T>()` does)
+  [`BasicJsonType::get<T>()`](../basic_json/get.md))
 - `#!cpp std::nullptr_t`
 - `#!cpp std::basic_string<char, Traits, Alloc>` (including `string_t`) — a copy of the string
 - [`string_view_t`](index.md#member-types) — **no copy**: the returned view points into the document's

docs/mkdocs/docs/api/macros/json_diagnostic_positions.md

@@ -35,6 +35,9 @@ Note that enabling this macro increases the size of every JSON value by two `std
 overhead to parsing, copying JSON value objects, and the generation of error messages for exceptions. It also causes
 these values to be reported in those error messages.
 
+If [`JSON_DIAGNOSTICS`](json_diagnostics.md) is also set, the message contains the path and the byte range, such as
+`(/1) (bytes 4-8)`. An exception about the root value has no path and only the range, such as `(bytes 0-4)`.
+
 ## Default definition
 
 The default value is `0` (position diagnostics are switched off).

include/nlohmann/detail/exceptions.hpp

@@ -198,18 +198,19 @@ class exception : public std::exception
             // all other parent types (primitives) contribute no token
         }
 
-        if (tokens.empty())
+        // the root value has no path, but still has a byte range
+        std::string prefix;
+        if (!tokens.empty())
         {
-            return "";
+            const auto str = std::accumulate(tokens.rbegin(), tokens.rend(), std::string{},
+                                             [](const std::string & a, const std::string & b)
+            {
+                return concat(a, '/', detail::escape(b));
+            });
+            prefix = concat('(', str, ") ");
         }
 
-        auto str = std::accumulate(tokens.rbegin(), tokens.rend(), std::string{},
-                                   [](const std::string & a, const std::string & b)
-        {
-            return concat(a, '/', detail::escape(b));
-        });
-
-        return concat('(', str, ") ", get_byte_positions(leaf_element));
+        return concat(prefix, get_byte_positions(leaf_element));
 #else
         return get_byte_positions(leaf_element);
 #endif
@@ -222,7 +223,8 @@ class exception : public std::exception
     template<typename BasicJsonType>
     static std::string get_byte_positions(const BasicJsonType* leaf_element)
     {
-        if ((leaf_element->start_pos() != std::string::npos) && (leaf_element->end_pos() != std::string::npos))
+        // a value-initialized iterator has no value (invalid_iterator.212)
+        if (leaf_element != nullptr && leaf_element->start_pos() != std::string::npos && leaf_element->end_pos() != std::string::npos)
         {
             return concat("(bytes ", std::to_string(leaf_element->start_pos()), "-", std::to_string(leaf_element->end_pos()), ") ");
         }

include/nlohmann/detail/view/errors.hpp

@@ -234,8 +234,7 @@ void value_range(const document_data& d, const node* n, std::size_t& start, std:
 
 /// the context basic_json puts in front of the message of an exception about
 /// a value: "(/path) " with JSON_DIAGNOSTICS (none for the root), then
-/// "(bytes a-b) " with JSON_DIAGNOSTIC_POSITIONS (with JSON_DIAGNOSTICS, only
-/// if there is a path)
+/// "(bytes a-b) " with JSON_DIAGNOSTIC_POSITIONS (also for the root)
 ///
 /// This and the throw helpers that take an error_site are templates, so that
 /// the path and range code is instantiated only where an exception can be
@@ -256,19 +255,19 @@ std::string diagnostics(const error_site site)
     std::string context;
 #if JSON_DIAGNOSTICS
     std::vector<std::string> tokens;
-    const bool found = edited ? value_path<true>(d, site.value(), tokens) : value_path<false>(d, site.value(), tokens);
-    if (!found || tokens.empty())
+    // a value that is not found leaves no tokens, like the root
+    static_cast<void>(edited ? value_path<true>(d, site.value(), tokens) : value_path<false>(d, site.value(), tokens));
+    if (!tokens.empty())
     {
-        // context is still empty; returning it keeps the copy elided (-Wnrvo)
-        return context;
+        // the root value has no path, but still has a byte range
+        std::string path;
+        for (const std::string& token : tokens)
+        {
+            path.push_back('/');
+            path += detail::escape(token);
+        }
+        context = concat('(', path, ") ");
     }
-    std::string path;
-    for (const std::string& token : tokens)
-    {
-        path.push_back('/');
-        path += detail::escape(token);
-    }
-    context = concat('(', path, ") ");
 #endif
 #if JSON_DIAGNOSTIC_POSITIONS
     std::size_t start = 0;

include/nlohmann/detail/view/value.hpp

@@ -33,37 +33,12 @@ namespace view
 template<typename T>
 struct value_tag {};
 
-/// whether basic_json reads T with a dedicated from_json() overload that does
-/// not accept a boolean: exactly number_integer_t, number_unsigned_t and
-/// number_float_t (the other arithmetic types convert a boolean to 0 or 1)
-template<typename T, typename BasicJsonType>
-struct rejects_boolean : std::integral_constant < bool,
-    std::is_same<T, typename BasicJsonType::number_integer_t>::value
-    || std::is_same<T, typename BasicJsonType::number_unsigned_t>::value
-    || std::is_same<T, typename BasicJsonType::number_float_t>::value >
-{};
-
-/// a boolean as T: 0 or 1
-template<typename T>
-NLOHMANN_VIEW_ALWAYS_INLINE T boolean_as(const document_data& /*d*/, const node& n, std::false_type /*rejects*/)
-{
-    return static_cast<T>((n.flags & node_flags::is_true) != 0);
-}
-
-/// a boolean as number_integer_t, number_unsigned_t or number_float_t: type_error.302, as in basic_json
-template<typename T>
-[[noreturn]] NLOHMANN_VIEW_ALWAYS_INLINE T boolean_as(const document_data& d, const node& n, std::true_type /*rejects*/)
-{
-    throw_type_error(error_site(&d, &n), exception_id::type_mismatch, "type must be number, but is ", value_type_name(static_cast<value_t>(n.kind)));
-}
-
 /*!
 @brief the number or boolean of a node converted to an arithmetic type
 
 As basic_json's get<T>() for arithmetic types: integers and floats are
-converted with static_cast, booleans give 0 or 1 (but throw type_error.302 for
-number_integer_t, number_unsigned_t and number_float_t, as basic_json does),
-and other types throw type_error.302.
+converted with static_cast, booleans give 0 or 1, and other types throw
+type_error.302.
 */
 template<typename T, typename BasicJsonType>
 NLOHMANN_VIEW_ALWAYS_INLINE T arithmetic_value(const document_data& d, const node& n)
@@ -77,7 +52,7 @@ NLOHMANN_VIEW_ALWAYS_INLINE T arithmetic_value(const document_data& d, const nod
         case value_t::number_float:
             return static_cast<T>(float_value<typename BasicJsonType::number_float_t>(d, n));
         case value_t::boolean:
-            return boolean_as<T>(d, n, rejects_boolean<T, BasicJsonType> {});
+            return static_cast<T>((n.flags & node_flags::is_true) != 0);
         case value_t::null:
         case value_t::object:
         case value_t::array:

single_include/nlohmann/json.hpp

@@ -5695,18 +5695,19 @@ class exception : public std::exception
             // all other parent types (primitives) contribute no token
         }
 
-        if (tokens.empty())
+        // the root value has no path, but still has a byte range
+        std::string prefix;
+        if (!tokens.empty())
         {
-            return "";
+            const auto str = std::accumulate(tokens.rbegin(), tokens.rend(), std::string{},
+                                             [](const std::string & a, const std::string & b)
+            {
+                return concat(a, '/', detail::escape(b));
+            });
+            prefix = concat('(', str, ") ");
         }
 
-        auto str = std::accumulate(tokens.rbegin(), tokens.rend(), std::string{},
-                                   [](const std::string & a, const std::string & b)
-        {
-            return concat(a, '/', detail::escape(b));
-        });
-
-        return concat('(', str, ") ", get_byte_positions(leaf_element));
+        return concat(prefix, get_byte_positions(leaf_element));
 #else
         return get_byte_positions(leaf_element);
 #endif
@@ -5719,7 +5720,8 @@ class exception : public std::exception
     template<typename BasicJsonType>
     static std::string get_byte_positions(const BasicJsonType* leaf_element)
     {
-        if ((leaf_element->start_pos() != std::string::npos) && (leaf_element->end_pos() != std::string::npos))
+        // a value-initialized iterator has no value (invalid_iterator.212)
+        if (leaf_element != nullptr && leaf_element->start_pos() != std::string::npos && leaf_element->end_pos() != std::string::npos)
         {
             return concat("(bytes ", std::to_string(leaf_element->start_pos()), "-", std::to_string(leaf_element->end_pos()), ") ");
         }

single_include/nlohmann/json_view.hpp

@@ -5076,8 +5076,7 @@ void value_range(const document_data& d, const node* n, std::size_t& start, std:
 
 /// the context basic_json puts in front of the message of an exception about
 /// a value: "(/path) " with JSON_DIAGNOSTICS (none for the root), then
-/// "(bytes a-b) " with JSON_DIAGNOSTIC_POSITIONS (with JSON_DIAGNOSTICS, only
-/// if there is a path)
+/// "(bytes a-b) " with JSON_DIAGNOSTIC_POSITIONS (also for the root)
 ///
 /// This and the throw helpers that take an error_site are templates, so that
 /// the path and range code is instantiated only where an exception can be
@@ -5098,19 +5097,19 @@ std::string diagnostics(const error_site site)
     std::string context;
 #if JSON_DIAGNOSTICS
     std::vector<std::string> tokens;
-    const bool found = edited ? value_path<true>(d, site.value(), tokens) : value_path<false>(d, site.value(), tokens);
-    if (!found || tokens.empty())
+    // a value that is not found leaves no tokens, like the root
+    static_cast<void>(edited ? value_path<true>(d, site.value(), tokens) : value_path<false>(d, site.value(), tokens));
+    if (!tokens.empty())
     {
-        // context is still empty; returning it keeps the copy elided (-Wnrvo)
-        return context;
+        // the root value has no path, but still has a byte range
+        std::string path;
+        for (const std::string& token : tokens)
+        {
+            path.push_back('/');
+            path += detail::escape(token);
+        }
+        context = concat('(', path, ") ");
     }
-    std::string path;
-    for (const std::string& token : tokens)
-    {
-        path.push_back('/');
-        path += detail::escape(token);
-    }
-    context = concat('(', path, ") ");
 #endif
 #if JSON_DIAGNOSTIC_POSITIONS
     std::size_t start = 0;
@@ -10067,37 +10066,12 @@ namespace view
 template<typename T>
 struct value_tag {};
 
-/// whether basic_json reads T with a dedicated from_json() overload that does
-/// not accept a boolean: exactly number_integer_t, number_unsigned_t and
-/// number_float_t (the other arithmetic types convert a boolean to 0 or 1)
-template<typename T, typename BasicJsonType>
-struct rejects_boolean : std::integral_constant < bool,
-    std::is_same<T, typename BasicJsonType::number_integer_t>::value
-    || std::is_same<T, typename BasicJsonType::number_unsigned_t>::value
-    || std::is_same<T, typename BasicJsonType::number_float_t>::value >
-{};
-
-/// a boolean as T: 0 or 1
-template<typename T>
-NLOHMANN_VIEW_ALWAYS_INLINE T boolean_as(const document_data& /*d*/, const node& n, std::false_type /*rejects*/)
-{
-    return static_cast<T>((n.flags & node_flags::is_true) != 0);
-}
-
-/// a boolean as number_integer_t, number_unsigned_t or number_float_t: type_error.302, as in basic_json
-template<typename T>
-[[noreturn]] NLOHMANN_VIEW_ALWAYS_INLINE T boolean_as(const document_data& d, const node& n, std::true_type /*rejects*/)
-{
-    throw_type_error(error_site(&d, &n), exception_id::type_mismatch, "type must be number, but is ", value_type_name(static_cast<value_t>(n.kind)));
-}
-
 /*!
 @brief the number or boolean of a node converted to an arithmetic type
 
 As basic_json's get<T>() for arithmetic types: integers and floats are
-converted with static_cast, booleans give 0 or 1 (but throw type_error.302 for
-number_integer_t, number_unsigned_t and number_float_t, as basic_json does),
-and other types throw type_error.302.
+converted with static_cast, booleans give 0 or 1, and other types throw
+type_error.302.
 */
 template<typename T, typename BasicJsonType>
 NLOHMANN_VIEW_ALWAYS_INLINE T arithmetic_value(const document_data& d, const node& n)
@@ -10111,7 +10085,7 @@ NLOHMANN_VIEW_ALWAYS_INLINE T arithmetic_value(const document_data& d, const nod
         case value_t::number_float:
             return static_cast<T>(float_value<typename BasicJsonType::number_float_t>(d, n));
         case value_t::boolean:
-            return boolean_as<T>(d, n, rejects_boolean<T, BasicJsonType> {});
+            return static_cast<T>((n.flags & node_flags::is_true) != 0);
         case value_t::null:
         case value_t::object:
         case value_t::array:

tests/src/unit-conversions1.cpp

@@ -1260,44 +1260,6 @@ TEST_CASE("value conversion")
     #undef JSON_HAS_CPP_17
 #endif
 
-TEST_CASE("get<T>() of a boolean (#5988)")
-{
-    // a boolean converts to 0/1 for every arithmetic type except number_integer_t, number_unsigned_t and
-    // number_float_t, whose dedicated from_json() overloads throw
-    const json t = true;
-    const json f = false;
-
-    SECTION("0 and 1")
-    {
-        // long and unsigned long are left out: they are std::int64_t and std::uint64_t on some platforms
-        CHECK(t.get<bool>() == true);
-        CHECK(f.get<bool>() == false);
-        CHECK(t.get<char>() == 1);
-        CHECK(t.get<signed char>() == 1);
-        CHECK(t.get<unsigned char>() == 1);
-        CHECK(t.get<short>() == 1); // NOLINT(google-runtime-int)
-        CHECK(t.get<unsigned short>() == 1); // NOLINT(google-runtime-int)
-        CHECK(t.get<int>() == 1);
-        CHECK(t.get<unsigned>() == 1);
-        CHECK(t.get<float>() == 1.0F);
-        CHECK(t.get<long double>() == 1.0L);
-        CHECK(f.get<int>() == 0);
-        CHECK(f.get<float>() == 0.0F);
-    }
-
-#if !defined(JSON_NOEXCEPTION)
-    SECTION("number_integer_t, number_unsigned_t and number_float_t throw")
-    {
-        CHECK_THROWS_WITH_AS(t.get<json::number_integer_t>(), "[json.exception.type_error.302] type must be number, but is boolean", json::type_error&);
-        CHECK_THROWS_WITH_AS(t.get<json::number_unsigned_t>(), "[json.exception.type_error.302] type must be number, but is boolean", json::type_error&);
-        CHECK_THROWS_WITH_AS(t.get<json::number_float_t>(), "[json.exception.type_error.302] type must be number, but is boolean", json::type_error&);
-        CHECK_THROWS_WITH_AS(f.get<json::number_integer_t>(), "[json.exception.type_error.302] type must be number, but is boolean", json::type_error&);
-        CHECK_THROWS_WITH_AS(f.get<json::number_unsigned_t>(), "[json.exception.type_error.302] type must be number, but is boolean", json::type_error&);
-        CHECK_THROWS_WITH_AS(f.get<json::number_float_t>(), "[json.exception.type_error.302] type must be number, but is boolean", json::type_error&);
-    }
-#endif
-}
-
 #ifdef JSON_HAS_CPP_14
     #undef JSON_HAS_CPP_14
 #endif

tests/src/unit-diagnostic-positions.cpp

@@ -193,6 +193,28 @@ TEST_CASE("Better diagnostics with positions")
         check_conversion(300);
     }
 
+    SECTION("exception about the root value (#5987)")
+    {
+        // the root has no path, but still has a byte range
+        const json root = json::parse("true");
+        const json nested = json::parse("[1, true]");
+        const json constructed = true;
+#if JSON_DIAGNOSTICS
+        CHECK_THROWS_WITH_AS(root.get<std::string>(),
+                             "[json.exception.type_error.302] (bytes 0-4) type must be string, but is boolean", json::type_error);
+        CHECK_THROWS_WITH_AS(nested[1].get<std::string>(),
+                             "[json.exception.type_error.302] (/1) (bytes 4-8) type must be string, but is boolean", json::type_error);
+#else
+        CHECK_THROWS_WITH_AS(root.get<std::string>(),
+                             "[json.exception.type_error.302] (bytes 0-4) type must be string, but is boolean", json::type_error);
+        CHECK_THROWS_WITH_AS(nested[1].get<std::string>(),
+                             "[json.exception.type_error.302] (bytes 4-8) type must be string, but is boolean", json::type_error);
+#endif
+        // a value without positions gets no range and no stray whitespace
+        CHECK_THROWS_WITH_AS(constructed.get<std::string>(),
+                             "[json.exception.type_error.302] type must be string, but is boolean", json::type_error);
+    }
+
     SECTION("JSON patch add to primitive parent (#4292)")
     {
         // the JSON Patch "add" target /foo/bar/baz has a string parent
@@ -243,3 +265,14 @@ TEST_CASE("values read from a binary format have no positions")
         check_no_positions(j);
     }
 }
+
+TEST_CASE("comparing a value-initialized iterator throws invalid_iterator.212")
+{
+    // such an iterator has no value to take the byte positions from; the
+    // comparison used to dereference the null pointer instead of throwing
+    json j = {1, 2};
+    json::iterator it{};
+    CHECK_THROWS_WITH_AS(it == j.begin(), "[json.exception.invalid_iterator.212] cannot compare iterators of different containers", json::invalid_iterator);
+    CHECK_THROWS_WITH_AS(it < j.begin(), "[json.exception.invalid_iterator.212] cannot compare iterators of different containers", json::invalid_iterator);
+    CHECK_THROWS_WITH_AS(j.begin() == it, "[json.exception.invalid_iterator.212] cannot compare iterators of different containers", json::invalid_iterator);
+}

tests/src/unit-json_view.cpp

@@ -1551,85 +1551,6 @@ TEST_CASE("json_view values")
     }
 }
 
-namespace
-{
-// get<T>() of a boolean: the same value or the same exception in basic_json and in the view (#5988)
-template<typename T>
-void check_boolean_get_parity()
-{
-    for (const bool b :
-            {
-                true, false
-            })
-    {
-        const std::string text = b ? "true" : "false";
-        const json j = json::parse(text);
-        const json_document d = json_document::parse(text);
-        CAPTURE(text)
-#if !defined(JSON_NOEXCEPTION)
-        T dom_value {};
-        T view_value{};
-        const std::string dom_error = json_view_test::exception_of_call([&] { dom_value = j.get<T>(); });
-        const std::string view_error = json_view_test::exception_of_call([&] { view_value = d.root().template get<T>(); });
-        CHECK(dom_error == view_error);
-        if (dom_error.empty())
-        {
-            CHECK(dom_value == view_value);
-            CHECK(view_value == static_cast<T>(b));
-        }
-#else
-        // without exceptions, the combinations that throw (number_integer_t, number_unsigned_t, number_float_t)
-        // cannot be run: JSON_THROW aborts
-        const bool throws = std::is_same<T, json::number_integer_t>::value
-                            || std::is_same<T, json::number_unsigned_t>::value
-                            || std::is_same<T, json::number_float_t>::value;
-        if (!throws)
-        {
-            CHECK(j.get<T>() == d.root().template get<T>());
-        }
-#endif
-    }
-}
-} // namespace
-
-TEST_CASE("json_view get<T>() of a boolean (#5988)")
-{
-    check_boolean_get_parity<bool>();
-    check_boolean_get_parity<char>();
-    check_boolean_get_parity<signed char>();
-    check_boolean_get_parity<unsigned char>();
-    check_boolean_get_parity<short>(); // NOLINT(google-runtime-int)
-    check_boolean_get_parity<unsigned short>(); // NOLINT(google-runtime-int)
-    check_boolean_get_parity<int>();
-    check_boolean_get_parity<unsigned>();
-    check_boolean_get_parity<long>(); // NOLINT(google-runtime-int)
-    check_boolean_get_parity<unsigned long>(); // NOLINT(google-runtime-int)
-    check_boolean_get_parity<long long>(); // NOLINT(google-runtime-int)
-    check_boolean_get_parity<unsigned long long>(); // NOLINT(google-runtime-int)
-    check_boolean_get_parity<std::int64_t>();
-    check_boolean_get_parity<std::uint64_t>();
-    check_boolean_get_parity<float>();
-    check_boolean_get_parity<double>();
-    check_boolean_get_parity<long double>();
-
-#if !defined(JSON_NOEXCEPTION)
-    SECTION("the exceptions of the exact number types")
-    {
-        const json_document d = json_document::parse("true");
-        CHECK_THROWS_WITH_AS(d.root().get<json::number_integer_t>(), json_view_test::message("type_error.302", "", 0, 4, "type must be number, but is boolean").c_str(), json::type_error&);
-        CHECK_THROWS_WITH_AS(d.root().get<json::number_unsigned_t>(), json_view_test::message("type_error.302", "", 0, 4, "type must be number, but is boolean").c_str(), json::type_error&);
-        CHECK_THROWS_WITH_AS(d.root().get<json::number_float_t>(), json_view_test::message("type_error.302", "", 0, 4, "type must be number, but is boolean").c_str(), json::type_error&);
-        CHECK(d.root().get<int>() == 1);
-        // get_to() and value() go through get<T>()
-        json::number_float_t x = 0;
-        CHECK_THROWS_AS(d.root().get_to(x), json::type_error&);
-        const json_document o = json_document::parse("{\"b\":true}");
-        CHECK_THROWS_AS(static_cast<void>(o.root().value("b", 0.0)), json::type_error&);
-        CHECK(o.root().value("b", 0) == 1);
-    }
-#endif
-}
-
 TEST_CASE("json_view JSON pointers")
 {
     SECTION("every value of generated documents")

tests/src/unit-json_view_positions.cpp

@@ -300,6 +300,27 @@ TEST_CASE("json_view materialize() source positions")
             static_cast<void>(j.at("list").at(1).get<int>());
         }));
     }
+
+    SECTION("exception about the root value (#5987)")
+    {
+        const json_document root = json_document::parse("true");
+        const json_document nested = json_document::parse("[1, true]");
+        CHECK(json_view_test::exception_of_call([&]
+        {
+            static_cast<void>(root.root().get<std::string>());
+        }) == "[json.exception.type_error.302] (bytes 0-4) type must be string, but is boolean");
+#if JSON_DIAGNOSTICS
+        CHECK(json_view_test::exception_of_call([&]
+        {
+            static_cast<void>(nested.root()[1].get<std::string>());
+        }) == "[json.exception.type_error.302] (/1) (bytes 4-8) type must be string, but is boolean");
+#else
+        CHECK(json_view_test::exception_of_call([&]
+        {
+            static_cast<void>(nested.root()[1].get<std::string>());
+        }) == "[json.exception.type_error.302] (bytes 4-8) type must be string, but is boolean");
+#endif
+    }
 #endif
 
     SECTION("edited documents")
@@ -550,12 +571,8 @@ TEST_CASE("json_view exceptions name the path and the bytes of the value")
         expected_zz += "(bytes 12-35) key 'zz' not found";
         CHECK(exception_of_call([&] { static_cast<void>(d.root().at(json::json_pointer("/people/0/zz"))); }) == expected_zz);
 
-        // the root has no path, and with JSON_DIAGNOSTICS then no bytes either (as basic_json)
-        std::string expected_missing = "[json.exception.out_of_range.403] ";
-#if !JSON_DIAGNOSTICS
-        expected_missing += "(bytes 0-79) ";
-#endif
-        expected_missing += "key 'missing' not found";
+        // the root has no path, but still its bytes (#5987)
+        const std::string expected_missing = "[json.exception.out_of_range.403] (bytes 0-79) key 'missing' not found";
         CHECK(exception_of_call([&] { static_cast<void>(d.root().at("missing")); }) == expected_missing);
     }