WIP

crates/nu-parser/src/parser.rs

@@ -1992,6 +1992,7 @@ pub fn parse_block_expression(
     if let Some(signature) = signature {
         output.signature = signature;
     } else if let Some(last) = working_set.delta.scope.last() {
+        // FIXME: this only supports the top $it. Instead, we should look for a free $it in the expression.
         if let Some(var_id) = last.get_var(b"$it") {
             let mut signature = Signature::new("");
             signature.required_positional.push(PositionalArg {

crates/nu-parser/src/type_check.rs

@@ -20,6 +20,7 @@ pub fn math_result_type(
     op: &mut Expression,
     rhs: &mut Expression,
 ) -> (Type, Option<ParseError>) {
+    //println!("checking: {:?} {:?} {:?}", lhs, op, rhs);
     match &op.expr {
         Expr::Operator(operator) => match operator {
             Operator::Plus => match (&lhs.ty, &rhs.ty) {