Constant rustc_query_system::dep_graph::serialized::DEP_NODE_WIDTH_BITS

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const DEP_NODE_WIDTH_BITS: usize = _; // 2usize
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Number of bits we need to store the number of used bytes in a SerializedDepNodeIndex. Note that wherever we encode byte widths like this we actually store the number of bytes used minus 1; for a 4-byte value we technically would have 5 widths to store, but using one byte to store zeroes (which are relatively rare) is a decent tradeoff to save a bit in our bitfields.