Rust

Bugfix: Fix a memleak with pollard #156

Job	Run time
build	19s
linting	17s
cross-testing (stable, ubuntu-latest, default)	13s
cross-testing (stable, ubuntu-latest, with-serde)	15s
cross-testing (stable, windows-latest, default)	1m 42s
cross-testing (stable, windows-latest, with-serde)	1m 15s
cross-testing (stable, macos-latest, default)	25s
cross-testing (stable, macos-latest, with-serde)	25s
cross-testing (nightly, ubuntu-latest, default)	13s
cross-testing (nightly, ubuntu-latest, with-serde)	13s
cross-testing (nightly, windows-latest, default)	1m 57s
cross-testing (nightly, windows-latest, with-serde)	1m 41s
cross-testing (nightly, macos-latest, default)	27s
cross-testing (nightly, macos-latest, with-serde)	34s
cross-testing (1.41, ubuntu-latest, default)	15s
cross-testing (1.41, ubuntu-latest, with-serde)	15s
cross-testing (1.41, windows-latest, default)	1m 20s
cross-testing (1.41, windows-latest, with-serde)	1m 50s
cross-testing (1.41, macos-latest, default)	37s
cross-testing (1.41, macos-latest, with-serde)	26s
	14m 39s

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