codegen: fix interpreter re-entrance

So multiple successive incremental Evals function correctly.

Also improve the following:
- Apply the same Eval API to vm0 and vm1
- parser: dot diagram display is now synchronous
- codegen: outsource complex code generation for readability
- vm1: Pop take the number of values to pop as operand

1 files changed, 1 insertions, 1 deletions

diff --git a/vm0/func.go b/vm0/func.go
index 6976530..ee503bc 100644
--- a/vm0/func.go
+++ b/vm0/func.go
@@ -60,7 +60,7 @@ func (i *Interp) declareFunc(r *parser.Node, scope string) {
 		for _, arg := range args {
 			i.push(arg.Interface())
 		}
-		if _, err := i.Run(r.Child[len(r.Child)-1], fscope); err != nil {
+		if err := i.Run(r.Child[len(r.Child)-1], fscope); err != nil {
 			panic(err)
 		}
 		b := len(i.stack) - len(out)