Fix compilation errors since last build #1034

Job	Run time
Build documentation	29s
Compute binary sizes	26s
Build benchmarks	25s
Fuzz test (fill_first_fit)	48s
Fuzz test (fill_optimal_fit)	51s
Minimum supported Rust version (no default features)	1m 37s
Build Wasm demo	17s
Fuzz test (fill_fast_path)	54s
Minimum supported Rust version (all features)	1m 45s
Ubuntu (stable, no default features)	13s
Minimum supported Rust version (default features)	1m 44s
Fuzz test (wrap_first_fit)	1m 4s
Ubuntu (stable, all features)	36s
Windows (stable, default features)	52s
Fuzz test (wrap_optimal_fit)	48s
Ubuntu (stable, default features)	15s
Fuzz test (wrap_optimal_fit_usize)	48s
Ubuntu (nightly, no default features)	19s
Ubuntu (nightly, all features)	25s
Fuzz test (wrap_fast_path)	51s
Fuzz test (unfill)	48s
Ubuntu (nightly, default features)	16s
Fuzz test (refill)	49s
Deploy Wasm demo	0s
	17m 20s

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