functions now capture variables :D

core/compiler.go

@@ -587,6 +587,7 @@ func (c *Compiler) compile(tree Node) error {
 			n.yield,
 			c.Chunk,
 			nil,
+			nil,
 		}
 
 		// restore old chunk and ip
@@ -958,6 +959,13 @@ func (c *Compiler) deduceSignature(tree Node) (TypeSignature, error) {
 		}
 
 		return nil, c.error(fmt.Sprintf("unimplemented result type deduction for unary %s", n.UnaryOperation), n)
+	case BlockNodeType:
+		n := tree.(*BlockNode)
+		if len(n.statements) == 0 {
+			return &NilSignature{}, nil
+		}
+
+		return c.deduceSignature(n.statements[len(n.statements)-1])
 	default:
 		return nil, c.error(fmt.Sprintf("impossible to deduce signature of %s", tree.Type()), tree)
 	}