Cleaned up function type

src/build/Return.go

@@ -0,0 +1,18 @@
+package build
+
+import (
+	"git.akyoto.dev/cli/q/src/build/expression"
+	"git.akyoto.dev/cli/q/src/build/token"
+)
+
+// CompileReturn compiles a return instruction.
+func (f *Function) CompileReturn(tokens token.List) error {
+	if len(tokens) > 1 {
+		value := expression.Parse(tokens[1:])
+		defer value.Close()
+		// TODO: Set the return value
+	}
+
+	f.assembler.Return()
+	return nil
+}