Add patch.

Author: reitermarkus

Cargo.lock

@@ -32,6 +32,12 @@ include = [
 [badges]
 travis-ci = { repository = "rust-lang/rust-bindgen" }
 
+[workspace]
+members = [
+  "bindgen-integration",
+  "tests/quickchecking",
+]
+
 [lib]
 path = "src/lib.rs"
 
@@ -86,3 +92,7 @@ testing_only_docs = []
 testing_only_extra_assertions = []
 testing_only_libclang_9 = []
 testing_only_libclang_5 = []
+
+[patch.crates-io]
+cexpr = { git = "https://github.com/reitermarkus/rust-cexpr", branch = "cast-expr" }
+# cexpr = { path = "./rust-cexpr" }