Switch to ungrammar from ast_src

The primary advantage of ungrammar is that it (eventually) allows one
to describe concrete syntax tree structure -- with alternatives and
specific sequence of tokens & nodes.

That should be re-usable for:

* generate `make` calls
* Rust reference
* Hypothetical parser's evented API

We loose doc comments for the time being unfortunately. I don't think
we should add support for doc comments to ungrammar -- they'll make
grammar file hard to read. We might supply docs as out-of band info,
or maybe just via a reference, but we'll think about that once things
are no longer in flux

1 files changed, 5 insertions, 4 deletions

diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
index d1cfb5909..8140da87f 100644
--- a/xtask/Cargo.toml
+++ b/xtask/Cargo.toml
@@ -10,9 +10,10 @@ license = "MIT OR Apache-2.0"
 doctest = false
 
 [dependencies]
-walkdir = "2.3.1"
-pico-args = "0.3.1"
-quote = "1.0.2"
-proc-macro2 = "1.0.8"
 anyhow = "1.0.26"
 flate2 = "1.0"
+pico-args = "0.3.1"
+proc-macro2 = "1.0.8"
+quote = "1.0.2"
+ungrammar = "0.1.0"
+walkdir = "2.3.1"