Make module entry point more procedure like

1 files changed, 13 insertions, 5 deletions

diff --git a/boot/dependency.cc b/boot/dependency.cc
index 9b52ce9..1eb5953 100644
--- a/boot/dependency.cc
+++ b/boot/dependency.cc
@@ -26,15 +26,23 @@ along with GCC; see the file COPYING3.  If not see
 
 namespace elna::boot
 {
-    circular_import_error::circular_import_error(const source_position position,
-            const std::string& module_name)
-        : diagnostic(position), module_name(module_name)
+    import_error::import_error(const source_position position,
+            const std::string& module_name, const kind payload)
+        : diagnostic(position), module_name(module_name), m_payload(payload)
     {
     }
 
-    std::string circular_import_error::what() const
+    std::string import_error::what() const
     {
-        return "Circular import of module '" + this->module_name + "'";
+        switch (this->m_payload)
+        {
+            case kind::circular:
+                return "Circular import of module '" + this->module_name + "'";
+            case kind::program:
+                return "Module '" + this->module_name + "' is a program and cannot be imported";
+            default:
+                __builtin_unreachable();
+        }
     }
 
     read_result read_source(std::istream& entry_point, const target_info& target)