cue: introduce let declaration
This only implements let as a top-level declaration;
it does not yet implement let expressions in
comprehensions.
This is the first step to deprecate aliases of the form `X=foo`
The meaning of `=` is different in all other cases and is
confusing. Also, after some time of deprecating the old
aliases, it can be reintroduced as an alias for embedding.
This change does not yet do the automated rewriting.
Issue #339
Change-Id: Iaf6f9bf09e1bef7e18c35b776e7d415f526a02cc
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/5684
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>
diff --git a/internal/encoding/encoding.go b/internal/encoding/encoding.go
index e720284..379e378 100644
--- a/internal/encoding/encoding.go
+++ b/internal/encoding/encoding.go
@@ -395,7 +395,7 @@
case *ast.Ellipsis:
check(n, constraints, "ellipsis", true)
- case *ast.Ident, *ast.SelectorExpr, *ast.Alias:
+ case *ast.Ident, *ast.SelectorExpr, *ast.Alias, *ast.LetClause:
check(n, i.References, "references", true)
default:
