tree 26c6fbcc9480c86862d0fecb00ff450e5c847090
parent c1309787cc4b55cb1d11e60a687f27b9b38ed09c
author fzaiser <fzaiser@google.com> 1503935451 +0200
committer Vladimir Moskva <vladmos@google.com> 1504006270 +0200

Visit subtrees of the AST in evaluation order

For instance, it makes more sense to visit the RHS of an assignment
first because this is evaluated first.

This also fixes a bug in the validator, which allowed definitions
like "a = a"

RELNOTES: None
PiperOrigin-RevId: 166709589