Refactor parser fuzz testing

crates/ra_syntax/fuzz/Cargo.toml

@@ -4,14 +4,14 @@ name = "ra_syntax-fuzz"
 version = "0.0.1"
 authors = ["rust-analyzer developers"]
 publish = false
+edition = "2018"
 
 [package.metadata]
 cargo-fuzz = true
 
-[dependencies.ra_syntax]
-path = ".."
-[dependencies.libfuzzer-sys]
-git = "https://github.com/rust-fuzz/libfuzzer-sys.git"
+[dependencies]
+ra_syntax = { path = ".." }
+libfuzzer-sys = { git = "https://github.com/rust-fuzz/libfuzzer-sys.git" }
 
 # Prevent this from interfering with workspaces
 [workspace]

crates/ra_syntax/fuzz/fuzz_targets/parser.rs

@@ -1,9 +1,9 @@
 #![no_main]
-#[macro_use] extern crate libfuzzer_sys;
-extern crate ra_syntax;
+use libfuzzer_sys::fuzz_target;
+use ra_syntax::fuzz::check_parser;
 
 fuzz_target!(|data: &[u8]| {
     if let Ok(text) = std::str::from_utf8(data) {
-        ra_syntax::check_fuzz_invariants(text)
+        check_parser(text)
     }
 });

crates/ra_syntax/src/fuzz.rs

@@ -0,0 +1,12 @@
+use crate::{SourceFile, validation, AstNode};
+
+fn check_file_invariants(file: &SourceFile) {
+    let root = file.syntax();
+    validation::validate_block_structure(root);
+    let _ = file.errors();
+}
+
+pub fn check_parser(text: &str) {
+    let file = SourceFile::parse(text);
+    check_file_invariants(&file);
+}

crates/ra_syntax/src/lib.rs

@@ -29,6 +29,8 @@ mod ptr;
 
 pub mod algo;
 pub mod ast;
+#[doc(hidden)]
+pub mod fuzz;
 
 pub use rowan::{SmolStr, TextRange, TextUnit};
 pub use ra_parser::SyntaxKind;
@@ -83,13 +85,6 @@ impl SourceFile {
     }
 }
 
-pub fn check_fuzz_invariants(text: &str) {
-    let file = SourceFile::parse(text);
-    let root = file.syntax();
-    validation::validate_block_structure(root);
-    let _ = file.errors();
-}
-
 /// This test does not assert anything and instead just shows off the crate's
 /// API.
 #[test]

crates/ra_syntax/tests/test.rs

@@ -8,7 +8,7 @@ use std::{
 };
 
 use test_utils::{project_dir, dir_tests, read_text, collect_tests};
-use ra_syntax::{SourceFile, AstNode, check_fuzz_invariants};
+use ra_syntax::{SourceFile, AstNode, fuzz};
 
 #[test]
 fn lexer_tests() {
@@ -47,7 +47,7 @@ fn parser_tests() {
 #[test]
 fn parser_fuzz_tests() {
     for (_, text) in collect_tests(&test_data_dir(), &["parser/fuzz-failures"]) {
-        check_fuzz_invariants(&text)
+        fuzz::check_parser(&text)
     }
 }