1 files changed, 17 insertions, 1 deletions
diff --git a/compiler.d b/compiler.d
index ecd7785..992e36b 100644
--- a/compiler.d
+++ b/compiler.d
@@ -483,7 +483,7 @@ class Compiler {
         ValueType vt = this.resolve(args[0], ValueType.STRING);
         for (int i = 1; i < args.length; i++) {
             vt = this.resolve(args[i], ValueType.STRING);
-            this.func.chunk.writeOp(OpCode.OP_TYPE_CHECK_STRING, args[i].line);
+            this.func.chunk.writeOp(OpCode.OP_TYPE_CHECK_SEQ, args[i].line); // TODO wrong
             this.func.chunk.writeOp(OpCode.OP_CONCAT, args[i].line);
         }
         return ValueType.STRING;
@@ -544,6 +544,22 @@ class Compiler {
         this.func.chunk.writeOp(OpCode.OP_LENGTH, args[0].line);
     }
 
+    void compileAppend(Form[] args) {
+        if (args.length != 2) {
+            this.error(format("'append': expected [2] arguments, received %d", args.length), -1);
+            this.advance();
+            return;
+        }
+
+        ValueType vt1 = this.resolve(args[0], ValueType.SEQ);
+        this.func.chunk.writeOp(OpCode.OP_TYPE_CHECK_SEQ, args[0].line);
+
+        // TODO if this is used for both string/list, should be able to typecheck second arg here
+        ValueType vt2 = this.resolve(args[1], ValueType.ANY);
+
+        this.func.chunk.writeOp(OpCode.OP_CONCAT, args[0].line);
+    }
+
     void compileFirst(Form[] args) {
         // TODO how do we identify/propagate errors?
         if (args.length != 1) {