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Warn about index-of type errors when not iterable
This is just documentation of existing behavior, it does not change anything. The reason index-of throws a type error on non-iterable types is because `next` does. This is hardcoded into the JOP_NEXT opcode (see src/core/value.c:janet_next_impl). Unfortunately, there is currently no corresponding `iterable?` check.
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@ -1072,7 +1072,9 @@
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(defn index-of
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``Find the first key associated with a value x in a data structure, acting like a reverse lookup.
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Will not look at table prototypes.
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Returns `dflt` if not found.``
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Returns `dflt` if not found.
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This will throw an error if `ind` is not iterable.``
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[x ind &opt dflt]
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(var k (next ind nil))
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(var ret dflt)
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