cmd/cue: update get to use definitions
This also involves updates to the Kubernetes tutorial
Closes #83
Change-Id: I02e52cbf21efd6ba15ac87bb5db852e2b9f115ec
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/3046
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>
diff --git a/doc/ref/spec.md b/doc/ref/spec.md
index 453c77e..ca04260 100644
--- a/doc/ref/spec.md
+++ b/doc/ref/spec.md
@@ -1059,6 +1059,11 @@
ExpressionLabel = BindLabel | [ BindLabel ] "[" [ Expression ] "]" .
-->
+<!-- TODO: strongly consider relaxing an embedding to be an Expression, instead
+of Operand. This will tie in with using dots instead of spaces on the LHS,
+comprehensions and the ability to generate good error messages, so thread
+carefully.
+-->
```
StructLit = "{" [ DeclarationList [ "," [ "..." ] ] "}" .
DeclarationList = Declaration { "," Declaration }
