Too long compile time with implementing a trait function

I found that implementing a specific trait function causes too long compile time.

If there is expression function implementation at https://github.com/veryl-lang/veryl/blob/3516e3c73a62a9d74301336a4cf7d11013445e57/crates/emitter/src/emitter.rs#L984 , compilation time is 1600s.
And if the implmentation is commented out, compilation time is 5s.

If codegen-units = 1 is specified, there is no problem.

The reproduce way is here:

git clone https://github.com/veryl-lang/veryl -b v0.12.0
cd veryl
git submodule update --init
sed -i 's/codegen/#codegen/' Cargo.toml
rm ./crates/parser/build.rs

# remove `expression` function implementation
sed -i '984,992d' ./crates/emitter/src/emitter.rs

# compile dependencies at first
cargo build --release --manifest-path crates/emitter/Cargo.toml

# There is not `expression` function implementation
# about 5s
touch  ./crates/emitter/src/emitter.rs
time cargo build --release --manifest-path crates/emitter/Cargo.toml

# There is `expression` function implementation
# about 1600s
git checkout ./crates/emitter/src/emitter.rs
time cargo build --release --manifest-path crates/emitter/Cargo.toml

Meta

rustc --version --verbose:

rustc 1.80.1 (3f5fd8dd4 2024-08-06)
binary: rustc
commit-hash: 3f5fd8dd41153bc5fdca9427e9e05be2c767ba23
commit-date: 2024-08-06
host: x86_64-unknown-linux-gnu
release: 1.80.1
LLVM version: 18.1.7

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