refactor: Remove -Awarnings from snapshot tests and fix fix_unused_unsafe test

c2rust-refactor/src/transform/funcs.rs

@@ -279,7 +279,9 @@ impl Transform for ToMethod {
 ///
 /// Usage: `fix_unused_unsafe`
 ///
-/// Find unused `unsafe` blocks and turn them into ordinary blocks.
+/// Find unused `unsafe` blocks and turn them into ordinary blocks. This relies
+/// on the compiler's `#[warn(unused_unsafe)]` warnings, and will not work with warnings
+/// suppressed.
 pub struct FixUnusedUnsafe;
 
 impl Transform for FixUnusedUnsafe {

c2rust-refactor/tests/snapshots.rs

@@ -17,7 +17,7 @@ fn test_refactor_named(command: &str, path: &str) {
     let edition = "2021";
 
     let old_path = old_path.to_str().unwrap();
-    let rustc_args = [old_path, "--edition", edition, "-Awarnings"];
+    let rustc_args = [old_path, "--edition", edition];
 
     lib_main(Options {
         rewrite_modes: vec![OutputMode::Alongside],

c2rust-refactor/tests/snapshots/snapshots__refactor-fix_unused_unsafe.rs.snap

@@ -10,11 +10,11 @@ fn main() {
         let _safe_val = *ptr;
     }
 
-    unsafe {
+    {
         let x = 42;
     }
 
-    unsafe {}
+    {}
 
-    let _ = unsafe { 5 + 5 };
+    let _ = { 5 + 5 };
 }