chore: Error improvement and tidy

Author: vinniefalco

include/mrdox/Support/Error.hpp

@@ -16,6 +16,7 @@
 #include <mrdox/Support/Format.hpp>
 #include <exception>
 #include <iterator>
+#include <source_location>
 #include <string>
 #include <string_view>
 #include <type_traits>
@@ -37,7 +38,8 @@ class [[nodiscard]] MRDOX_DECL
     static
     std::string
     appendSourceLocation(
-        std::string&&, std::source_location const&);
+        std::string&&,
+        std::source_location const&);
 
 public:
     /** Constructor.
@@ -76,9 +78,9 @@ class [[nodiscard]] MRDOX_DECL
         std::string reason,
         std::source_location loc =
             std::source_location::current())
-        : message_(appendSourceLocation(
-            std::string(reason), loc))
+        : message_(appendSourceLocation(std::string(reason), loc))
         , reason_(std::move(reason))
+        , loc_(loc)
     {
         MRDOX_ASSERT(! message_.empty());
     }
@@ -101,7 +103,10 @@ class [[nodiscard]] MRDOX_DECL
     }
 
     explicit
-    Error(std::vector<Error> const& errors);
+    Error(
+        std::vector<Error> const& errors,
+        std::source_location loc =
+            std::source_location::current());
 
     /** Return true if this holds an error.
     */

source/Support/Error.cpp

@@ -40,7 +40,8 @@ appendSourceLocation(
 
 Error::
 Error(
-    std::vector<Error> const& errors)
+    std::vector<Error> const& errors,
+    std::source_location loc)
 {
     MRDOX_ASSERT(errors.size() > 0);
     if(errors.size() == 1)
@@ -56,6 +57,8 @@ Error(
         message_.append(err.message());
         message_.push_back('\n');
     }
+    reason_ = message_;
+    loc_ = loc;
 }
 
 SourceLocation::