Add specs for #each passing source yields by block arity (Enumerator and Lazy)#1365
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Add specs for #each passing source yields by block arity (Enumerator and Lazy)#1365sampokuokkanen wants to merge 1 commit into
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…and Lazy) Unlike the Enumerable collection methods, which pack yielded source values via rb_enum_values_pack() (0 args -> nil, 1 arg -> the value, N args -> Array), #each passes them to the block by ordinary block arity (rb_yield_values2() in CRuby): a single-argument block receives the first value, a multi-argument block destructures, and a splat block gathers them. Pin this explicitly via a shared describe used by both Enumerator#each and Enumerator::Lazy#each, complementing the value_packing specs.
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Unlike the Enumerable collection methods, which pack yielded source values via rb_enum_values_pack() (0 args -> nil, 1 arg -> the value, N args -> Array), #each passes them to the block by ordinary block arity (rb_yield_values2() in CRuby): a single-argument block receives the first value, a multi-argument block destructures, and a splat block gathers them.
Pin this explicitly via a shared describe used by both Enumerator#each and Enumerator::Lazy#each, complementing the value_packing specs.
This is so we catch bugs like I had in my implementation of packing in truffleruby/truffleruby#4272.