Merge changes from develop for the 1.58.0 release

include/boost/concept_check.hpp

@@ -818,9 +818,8 @@ namespace boost
       BOOST_CONCEPT_USAGE(Sequence)
       {
           S
-              c(n),
-              c2(n, t),
-              c3(first, last);
+              c(n, t),
+              c2(first, last);
 
           c.insert(p, t);
           c.insert(p, n, t);
@@ -833,7 +832,6 @@ namespace boost
 
           ignore_unused_variable_warning(c);
           ignore_unused_variable_warning(c2);
-          ignore_unused_variable_warning(c3);
           ignore_unused_variable_warning(r);
           const_constraints(c);
       }

meta/libraries.json

@@ -0,0 +1,15 @@
+{
+    "key": "concept_check",
+    "name": "Concept Check",
+    "authors": [
+        "Jeremy Siek"
+    ],
+    "description": "Tools for generic programming.",
+    "category": [
+        "Correctness",
+        "Generic"
+    ],
+    "maintainers": [
+        "Jeremy Siek <jeremy.siek -at- gmail.com>"
+    ]
+}

stl_concept_covering.cpp

@@ -3,6 +3,9 @@
 // accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
 
+// This file doesn't work on other compilers.
+#if defined(__GNUC__) || defined(__KCC)
+
 #include <algorithm>
 #include <numeric>
 #include <boost/config.hpp>
@@ -905,3 +908,9 @@ main()
   }
   return 0;
 }
+
+#else
+
+int main() {}
+
+#endif