Cover Expr serialize_highlight single target - #108
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Adds a focused test for
Expr::serialize_highlight, which had no coverage. The test parses a small expression, highlights a single target subterm, and asserts the exact ANSI-wrapped output, so the highlight offset handling stays correct.No syntax changes, no new features, test-only.
Validation:
CARGO_HOME=/home/user/Dev/.cargo-isolated RUSTFLAGS='-C target-cpu=native -Awarnings' cargo +nightly test -p mork-expr --test serializationrustfmt +nightly --edition 2024 --check expr/tests/serialization.rsgit diff --check