channel: Create list::Block directly on the heap
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The list channel's `Block::new` was causing a stack overflow because it held 32 item slots, instantiated on the stack before moving to `Box::new`. The 32x multiplier made modestly-large item sizes untenable. That block is now initialized directly on the heap. References from the `std` channel implementation: * rust-lang/rust#102246 * rust-lang/rust#132738
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The list channel's
Block::newwas causing a stack overflow because itheld 32 item slots, instantiated on the stack before moving to
Box::new. The 32x multiplier made modestly-large item sizes untenable.That block is now initialized directly on the heap.
References from the
stdchannel implementation:Blocks directly on the heap rust-lang/rust#132738