fix: encode() noexcept on throwing template

Author: alandefreitas

include/boost/url/encode.hpp

@@ -185,7 +185,7 @@ encode(
     core::string_view s,
     CS const& allowed,
     encoding_opts opt = {},
-    StringToken&& token = {}) noexcept;
+    StringToken&& token = {});
 
 } // urls
 } // boost

include/boost/url/impl/encode.hpp

@@ -278,7 +278,7 @@ encode(
     core::string_view s,
     CS const& allowed,
     encoding_opts opt,
-    StringToken&& token) noexcept
+    StringToken&& token)
 {
     BOOST_CORE_STATIC_ASSERT(
         grammar::is_charset<CS>::value);

test/unit/encode.cpp

@@ -209,12 +209,27 @@ class encode_test
         }
     }
 
+    void
+    testEncodeNoexcept()
+    {
+        // encode() buffer overload must not
+        // be noexcept (noexcept removal regression)
+        {
+            char buf[4];
+            static_assert(
+                !noexcept(encode(
+                    buf, sizeof(buf), "x", pchars)),
+                "");
+        }
+    }
+
     void
     run()
     {
         testEncode();
         testEncodeExtras();
         testEncodeZeroDest();
+        testEncodeNoexcept();
         testJavadocs();
     }
 };