kinda works except not

fuzz/.gitignore

@@ -0,0 +1,3 @@
+target
+corpus
+artifacts

fuzz/Cargo.lock

@@ -0,0 +1,116 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "anyhow"
+version = "1.0.56"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4361135be9122e0870de935d7c439aef945b9f9ddd4199a553b5270b49c82a27"
+
+[[package]]
+name = "arbitrary"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c38b6b6b79f671c25e1a3e785b7b82d7562ffc9cd3efdc98627e5668a2472490"
+dependencies = [
+ "derive_arbitrary",
+]
+
+[[package]]
+name = "cc"
+version = "1.0.73"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2fff2a6927b3bb87f9595d67196a70493f627687a71d87a0d692242c33f58c11"
+
+[[package]]
+name = "derive_arbitrary"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "98e23c06c035dac87bd802d98f368df73a7f2cb05a66ffbd1f377e821fac4af9"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.88 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "fuzz-rustc-ast"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "arbitrary",
+ "quote",
+ "syn 1.0.88 (git+https://github.com/Nilstrieb/syn?branch=arbitrary)",
+]
+
+[[package]]
+name = "fuzz-rustc-ast-fuzz"
+version = "0.0.0"
+dependencies = [
+ "fuzz-rustc-ast",
+ "libfuzzer-sys",
+]
+
+[[package]]
+name = "libfuzzer-sys"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "336244aaeab6a12df46480dc585802aa743a72d66b11937844c61bbca84c991d"
+dependencies = [
+ "arbitrary",
+ "cc",
+ "once_cell",
+]
+
+[[package]]
+name = "once_cell"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87f3e037eac156d1775da914196f0f37741a274155e34a0b7e427c35d2a2ecb9"
+
+[[package]]
+name = "proc-macro2"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7342d5883fbccae1cc37a2353b09c87c9b0f3afd73f5fb9bba687a1f733b029"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "864d3e96a899863136fc6e99f3d7cae289dafe43bf2c5ac19b70df7210c0a145"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.88"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ebd69e719f31e88618baa1eaa6ee2de5c9a1c004f1e9ecdb58e8352a13f20a01"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.88"
+source = "git+https://github.com/Nilstrieb/syn?branch=arbitrary#678493490de7c50b79b9461df9a67a22d43e5200"
+dependencies = [
+ "arbitrary",
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"

fuzz/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "fuzz-rustc-ast-fuzz"
+version = "0.0.0"
+authors = ["Automatically generated"]
+publish = false
+edition = "2018"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.fuzz-rustc-ast]
+path = ".."
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "ast"
+path = "fuzz_targets/ast.rs"
+test = false
+doc = false

fuzz/fuzz_targets/ast.rs

@@ -0,0 +1,8 @@
+#![no_main]
+use libfuzzer_sys::fuzz_target;
+
+use fuzz_rustc_ast::RustCode;
+
+fuzz_target!(|_data: RustCode| {
+    // fuzzed code goes here
+});