run_make_support: add rustfmt barriers to comments for use groups

Author: jieyouxu

src/tools/run-make-support/src/lib.rs

@@ -3,6 +3,9 @@
 //! notably is built via cargo: this means that if your test wants some non-trivial utility, such
 //! as `object` or `wasmparser`, they can be re-exported and be made available through this library.
 
+// Note that `#[rustfmt::skip]` barriers are added for comments intended for use groups to prevent
+// rustfmt from moving the comments.
+
 mod command;
 mod macros;
 mod util;
@@ -18,6 +21,8 @@ pub mod scoped_run;
 pub mod string;
 pub mod targets;
 
+// Internally we call our fs-related support module as `fs`, but re-export its content as `rfs`
+// to tests to avoid colliding with commonly used `use std::fs;`.
 mod fs;
 
 /// [`std::fs`] wrappers and assorted filesystem-related helpers. Public to tests as `rfs` to not be
@@ -27,16 +32,19 @@ pub mod rfs {
 }
 
 // Re-exports of third-party library crates.
+#[rustfmt::skip]
 pub use bstr;
 pub use gimli;
 pub use object;
 pub use regex;
 pub use wasmparser;
 
 // Re-exports of external dependencies.
+#[rustfmt::skip]
 pub use external_deps::{c_build, cc, clang, htmldocck, llvm, python, rustc, rustdoc};
 
 // These rely on external dependencies.
+#[rustfmt::skip]
 pub use c_build::build_native_static_lib;
 pub use cc::{cc, extra_c_flags, extra_cxx_flags, Cc};
 pub use clang::{clang, Clang};