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Change for protocol so that for functions return a bool #6183

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nikomatsakis opened this issue May 2, 2013 · 1 comment
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Change for protocol so that for functions return a bool #6183

nikomatsakis opened this issue May 2, 2013 · 1 comment
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A-codegen Area: Code generation A-type-system Area: Type system

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@nikomatsakis
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I argued in this blog post that this would be an improvement. Everyone seemed to agree. Nominating for milestone. I couldn't find an existing bug on this precise topic, but let me know if there is one.
@nikomatsakis
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In terms of the compiler, this is mostly a matter of modifying the type checker so that for statements have unit type, and modifying trans to ignore the return value.

@alexcrichton alexcrichton mentioned this issue May 3, 2013
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bors added a commit that referenced this issue May 11, 2013
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auto merge of #6223 : alexcrichton/rust/issue-6183, r=pcwalton
3e0400f 
Closes #6183.

The first commit changes the compiler's method of treating a `for` loop, and all the remaining commits are just dealing with the fallout.

The biggest fallout was the `IterBytes` trait, although it's really a whole lot nicer now because all of the `iter_bytes_XX` methods are just and-ed together. Sadly there was a huge amount of stuff that's `cfg(stage0)` gated, but whoever lands the next snapshot is going to have a lot of fun deleting all this code!
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