diff --git a/include/nlohmann/detail/input/parser.hpp b/include/nlohmann/detail/input/parser.hpp
index 1446f4524..9335542a0 100644
--- a/include/nlohmann/detail/input/parser.hpp
+++ b/include/nlohmann/detail/input/parser.hpp
@@ -573,11 +573,7 @@ class parser
 
     std::string exception_message(const token_type expected, const std::string& context)
     {
-        std::string error_msg = "syntax error ";
-
-        error_msg += concat("while parsing ", context, ' ');
-
-        error_msg += "- ";
+        std::string error_msg = concat("syntax error while parsing ", context, " - ");
 
         if (last_token == token_type::parse_error)
         {
diff --git a/include/nlohmann/detail/view/builder.hpp b/include/nlohmann/detail/view/builder.hpp
index 283cae075..14be4ea7c 100644
--- a/include/nlohmann/detail/view/builder.hpp
+++ b/include/nlohmann/detail/view/builder.hpp
@@ -1168,20 +1168,20 @@ indent_done:
             if (negative)
             {
                 ++p;
+                if (NLOHMANN_VIEW_UNLIKELY(cur() < '0' || cur() > '9'))
+                {
+                    return fail(error_code::number_after_minus);
+                }
             }
             const unsigned char* const int_start = p;
             if (cur() == '0')
             {
                 ++p;
             }
-            else if (!negative || NLOHMANN_VIEW_LIKELY(cur() >= '1' && cur() <= '9'))
-            {
-                // (without a sign, the dispatch saw a digit)
-                p = skip_digits(p + 1, e);
-            }
             else
             {
-                return fail(error_code::number_after_minus);
+                // (a digit: the dispatch or the check after the sign saw it)
+                p = skip_digits(p + 1, e);
             }
             const auto int_digits = static_cast<std::size_t>(p - int_start);
             std::size_t frac_digits = 0;
diff --git a/include/nlohmann/detail/view/errors.hpp b/include/nlohmann/detail/view/errors.hpp
index 3c97cef5c..74597edf0 100644
--- a/include/nlohmann/detail/view/errors.hpp
+++ b/include/nlohmann/detail/view/errors.hpp
@@ -251,8 +251,12 @@ std::string diagnostics(const error_site site)
     std::string context;
 #if JSON_DIAGNOSTICS
     std::vector<std::string> tokens;
-    // 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));
+    const bool found = edited ? value_path<true>(d, site.value(), tokens) : value_path<false>(d, site.value(), tokens);
+    if (!found)
+    {
+        // a value that is not found has no path, and with it no bytes
+        return context;
+    }
     if (!tokens.empty())
     {
         // the root value has no path, but still has a byte range
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index de59d701f..21b69100b 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -23777,11 +23777,7 @@ class parser
 
     std::string exception_message(const token_type expected, const std::string& context)
     {
-        std::string error_msg = "syntax error ";
-
-        error_msg += concat("while parsing ", context, ' ');
-
-        error_msg += "- ";
+        std::string error_msg = concat("syntax error while parsing ", context, " - ");
 
         if (last_token == token_type::parse_error)
         {
diff --git a/single_include/nlohmann/json_view.hpp b/single_include/nlohmann/json_view.hpp
index ea04acdbe..22c72d982 100644
--- a/single_include/nlohmann/json_view.hpp
+++ b/single_include/nlohmann/json_view.hpp
@@ -2473,20 +2473,20 @@ indent_done:
             if (negative)
             {
                 ++p;
+                if (NLOHMANN_VIEW_UNLIKELY(cur() < '0' || cur() > '9'))
+                {
+                    return fail(error_code::number_after_minus);
+                }
             }
             const unsigned char* const int_start = p;
             if (cur() == '0')
             {
                 ++p;
             }
-            else if (!negative || NLOHMANN_VIEW_LIKELY(cur() >= '1' && cur() <= '9'))
-            {
-                // (without a sign, the dispatch saw a digit)
-                p = skip_digits(p + 1, e);
-            }
             else
             {
-                return fail(error_code::number_after_minus);
+                // (a digit: the dispatch or the check after the sign saw it)
+                p = skip_digits(p + 1, e);
             }
             const auto int_digits = static_cast<std::size_t>(p - int_start);
             std::size_t frac_digits = 0;
@@ -5080,8 +5080,12 @@ std::string diagnostics(const error_site site)
     std::string context;
 #if JSON_DIAGNOSTICS
     std::vector<std::string> tokens;
-    // 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));
+    const bool found = edited ? value_path<true>(d, site.value(), tokens) : value_path<false>(d, site.value(), tokens);
+    if (!found)
+    {
+        // a value that is not found has no path, and with it no bytes
+        return context;
+    }
     if (!tokens.empty())
     {
         // the root value has no path, but still has a byte range
diff --git a/tests/src/unit-locale-cpp.cpp b/tests/src/unit-locale-cpp.cpp
index 441563b3c..19c08166c 100644
--- a/tests/src/unit-locale-cpp.cpp
+++ b/tests/src/unit-locale-cpp.cpp
@@ -505,8 +505,8 @@ struct locale_switching_token
 {
     using value_type = char;
 
-    locale_switching_token(std::string text_, const char* switch_to_)
-        : text(std::move(text_)), switch_to(switch_to_)
+    locale_switching_token(std::string text_, std::string switch_to_)
+        : text(std::move(text_)), switch_to(std::move(switch_to_))
     {}
 
     std::size_t size() const
@@ -523,13 +523,13 @@ struct locale_switching_token
     {
         if (!switched)
         {
-            switched = std::setlocale(LC_NUMERIC, switch_to) != nullptr;
+            switched = std::setlocale(LC_NUMERIC, switch_to.c_str()) != nullptr;
         }
         return &text[0];
     }
 
     std::string text;
-    const char* switch_to;
+    std::string switch_to;
     bool switched = false;
 };