Remove reference to tags, replace enums.
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@ -1346,7 +1346,7 @@ destructors. Resources might go away in the future.
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Rust datatypes are not trivial to copy (the way, for example,
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JavaScript values can be copied by simply taking one or two machine
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words and plunking them somewhere else). Shared boxes require
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reference count updates, big records, tags, or unique pointers require
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reference count updates, big records, enums, or unique pointers require
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an arbitrary amount of data to be copied (plus updating the reference
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counts of shared boxes hanging off them).
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@ -1459,7 +1459,7 @@ alt my_rec {
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The fact that arguments are conceptually passed by safe reference does
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not mean all arguments are passed by pointer. Composite types like
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records and tags *are* passed by pointer, but single-word values, like
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records and enums *are* passed by pointer, but single-word values, like
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integers and pointers, are simply passed by value. Most of the time,
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the programmer does not have to worry about this, as the compiler will
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simply pick the most efficient passing style. There is one exception,
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