a5615a7bae
Add `#:eager` options to `stream-cons` to control whether the head and/or tail expression is delayed. Also add `stream-lazy` to explicitly construct a lazy stream and `stream-force` (normally not needed) to force a stream. Delayed expressions in `stream-cons` are now non-reentrant, like promises created by `delay`. This is a change in behavior, but I'm hoping that no one relied on the old behavior, which has the bad property that the delayed expression is retained until its result is received. For consistency, this commit also changes `stream*` to delay the stream-construction expression when its the only one expression that is given. Internally, changes to the stream implementation reduce allocation. The `stream-lazy` form would be more natrally called `stream-delay`, but that creates a conflict with existing packages. |
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| README.md | ||
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