Changes in / [c38ae92:c0b23644]

File:

• src/SymTab/Validate.cc (modified) (4 diffs)

src/SymTab/Validate.cc

@@ -423 +423 @@
         }
 
+        void checkGenericParameters( ReferenceToType * inst ) {
+                for ( Expression * param : inst->parameters ) {
+                        if ( ! dynamic_cast< TypeExpr * >( param ) ) {
+                                throw SemanticError( "Expression parameters for generic types are currently unsupported: ", inst );
+                        }
+                }
+        }
+
         void LinkReferenceToTypes::postvisit( StructInstType *structInst ) {
                 StructDecl *st = local_indexer->lookupStruct( structInst->get_name() );
@@ -434 +442 @@
                         forwardStructs[ structInst->get_name() ].push_back( structInst );
                 } // if
+                checkGenericParameters( structInst );
         }
 
@@ -446 +455 @@
                         forwardUnions[ unionInst->get_name() ].push_back( unionInst );
                 } // if
+                checkGenericParameters( unionInst );
         }
 
@@ -525 +535 @@
                 // need to carry over the 'sized' status of each decl in the instance
                 for ( auto p : group_iterate( traitDecl->get_parameters(), traitInst->get_parameters() ) ) {
-                        TypeExpr * expr = strict_dynamic_cast< TypeExpr * >( std::get<1>(p) );
+                        TypeExpr * expr = dynamic_cast< TypeExpr * >( std::get<1>(p) );
+                        if ( ! expr ) {
+                                throw SemanticError( "Expression parameters for trait instances are currently unsupported: ", std::get<1>(p) );
+                        }
                         if ( TypeInstType * inst = dynamic_cast< TypeInstType * >( expr->get_type() ) ) {
                                 TypeDecl * formalDecl = std::get<0>(p);