Add GenericParamList to AssocTypeArg

Cargo.toml

diff --git a/Cargo.toml b/Cargo.toml
index 18c9dff..99b0205 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "ungrammar"
 description = "A DSL for describing concrete syntax trees"
-version = "1.14.1"
+version = "1.14.2"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/matklad/ungrammar"
 authors = ["Aleksey Kladov <aleksey.kladov@gmail.com>"]

rust.ungram

diff --git a/rust.ungram b/rust.ungram
index ce8e936..2ac52dd 100644
--- a/rust.ungram
+++ b/rust.ungram
@@ -51,7 +51,7 @@
   Type
 
 AssocTypeArg =
-  NameRef (':' TypeBoundList | '=' Type)
+  NameRef GenericParamList? (':' TypeBoundList | '=' Type)
 
 LifetimeArg =
   Lifetime