fable: Fix compatibility issues with nlohmann_json 3.11

Author: cassava

fable/include/fable/conf.hpp

@@ -190,9 +190,9 @@ class Conf {
     try {
       return data_.at(key).get<T>();
     } catch (nlohmann::detail::out_of_range&) {
-      throw_missing(key);
+      throw_missing(key.to_string());
     } catch (nlohmann::detail::type_error&) {
-      throw_wrong_type(key);
+      throw_wrong_type(key.to_string());
     }
   }
 
@@ -224,7 +224,7 @@ class Conf {
     } catch (nlohmann::detail::out_of_range&) {
       return def;
     } catch (nlohmann::detail::type_error&) {
-      throw_wrong_type(key);
+      throw_wrong_type(key.to_string());
     }
   }
 
@@ -279,7 +279,7 @@ class Conf {
     } catch (nlohmann::detail::out_of_range& e) {
       return;
     } catch (nlohmann::detail::type_error& e) {
-      throw_wrong_type(key);
+      throw_wrong_type(key.to_string());
     }
   }
 

fable/src/fable/conf.cpp

@@ -114,7 +114,7 @@ void Conf::assert_has(const std::string& key) const {
 
 void Conf::assert_has(const JsonPointer& key) const {
   if (!has(key)) {
-    throw_missing(key);
+    throw_missing(key.to_string());
   }
 }
 
@@ -130,7 +130,7 @@ void Conf::assert_has_not(const std::string& key, const std::string& msg) const
 
 void Conf::assert_has_not(const JsonPointer& key, const std::string& msg) const {
   if (has(key)) {
-    throw_unexpected(key, msg);
+    throw_unexpected(key.to_string(), msg);
   }
 }
 
@@ -144,7 +144,7 @@ void Conf::assert_has_type(const std::string& key, JsonType t) const {
 void Conf::assert_has_type(const JsonPointer& key, JsonType t) const {
   assert_has(key);
   if (data_.at(key).type() != t) {
-    throw_wrong_type(key, t);
+    throw_wrong_type(key.to_string(), t);
   }
 }
 

fable/src/fable/environment_test.cpp

@@ -25,6 +25,7 @@
 
 #include <gtest/gtest.h>       // for TEST, ASSERT_EQ, ...
 #include <boost/optional.hpp>  // for optional<>
+#include <boost/optional/optional_io.hpp>
 
 #include <fable/environment.hpp>  // for Environment