[h1994st]

Problem

The external examples have no cargo-fuzz target, the Rust half of what AFLplusplus/fuzz-reachability#4 integrates rllvm into.

Fix

• examples/external/rust-url: build rust-url v2.5.8's parse fuzz target through rllvm-rustc, extract it, and reach from libFuzzer's entry through url into idna.
• The README states what the bitcode leaves out (prebuilt std, libFuzzer's C++, outlined functions) and that cargo-fuzz's ASan and coverage instrumentation is captured, plus a plain cargo build --release of the crate, whose split codegen units need fix: link split codegen-unit bitcode from rustc #318.
• reproduce.sh builds the pinned tag on a macOS host, fails if any Rust function the binary defines outside std is missing from the bitcode, asserts the answers, and prints the recorded counts.

Verification

• reproduce.sh from a fresh clone on arm64 macOS: exit 0, 13 modules, 719 functions; shellcheck is clean.
• The std-only check flags <url::parser::Parser>::parse_file when that function is removed from the bitcode's symbol list.