Fix problems using reflection on interface types #1203.

lib/std/core/types.c3

@@ -302,6 +302,7 @@ enum TypeKind : char
 	VECTOR,
 	DISTINCT,
 	POINTER,
+	INTERFACE,
 }
 
 struct TypeEnum

releasenotes.md

@@ -29,6 +29,7 @@
 - Better checking of operator methods.
 - Bug when assigning an optional from an optional.
 - Lambdas were not type checked thoroughly #1185. 
+- Fix problems using reflection on interface types #1203.
 
 ### Stdlib changes
 - "init_new/init_temp" removed. 

src/compiler/sema_expr.c

@@ -3112,6 +3112,7 @@ static inline bool sema_expr_analyse_type_access(SemaContext *context, Expr *exp
 			return sema_expr_rewrite_to_type_property(context, expr, canonical, type_property_by_name(name), parent_type);
 		}
 	}
+
 	if (!type_may_have_sub_elements(canonical))
 	{
 		if (missing_ref) goto MISSING_REF;
@@ -3153,6 +3154,7 @@ static inline bool sema_expr_analyse_type_access(SemaContext *context, Expr *exp
 		case DECL_STRUCT:
 		case DECL_DISTINCT:
 		case DECL_BITSTRUCT:
+		case DECL_INTERFACE:
 			break;
 		default:
 			UNREACHABLE