Add `~const` bounds to rust grammar
diff --git a/Cargo.toml b/Cargo.toml
index 050459e..8e732c8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
[package]
name = "ungrammar"
description = "A DSL for describing concrete syntax trees"
-version = "1.14.8"
+version = "1.14.9"
license = "MIT OR Apache-2.0"
repository = "https://github.com/matklad/ungrammar"
edition = "2018"
diff --git a/rust.ungram b/rust.ungram
index 0af0f25..d2ef552 100644
--- a/rust.ungram
+++ b/rust.ungram
@@ -573,7 +573,7 @@
TypeBound =
Lifetime
-| '?'? Type
+| ('?' | '~' 'const')? Type
//************************//
// Patterns //