Internal compiler error passing an iterator as a parameter. #10467

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1. alexcrichton commented on Nov 13, 2013

   

   alexcrichton

   on Nov 13, 2013

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   What version of the compiler were you running this with? If you updated to the most recent version of master, I think that you'll probably see a better error (not certain, just a guess from looking at the program)
2. huonw commented on Nov 13, 2013

   

   huonw

   on Nov 13, 2013

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   With rustc 0.9-pre (825b127 2013-11-12 18:56:13 -0800), I see

   10467.rs:5:4: 5:13 error: internal compiler error: Cannot relate bound region: ReLateBound(6, BrNamed(syntax::ast::DefId{crate: 0, node: 20}, self)) <= ReInfer(70)
   This message reflects a bug in the Rust compiler. 
   We would appreciate a bug report: https://github.com/mozilla/rust/wiki/HOWTO-submit-a-Rust-bug-report
   10467.rs:5     cat_files(&args.iter().skip(1));
                  ^~~~~~~~~
   task 'rustc' failed at 'explicit failure', /home/huon/rust/src/libsyntax/diagnostic.rs:75
   task '<main>' failed at 'explicit failure', /home/huon/rust/src/librustc/lib.rs:396
   

   when running on the reduced

   fn cat_files<'self, T: Iterator<&'self ~str>>(_: &T) {}
   
   fn main() {
       let args = [~"foo"];
       cat_files(&args.iter().skip(1));
   }

   It's the same error message as #10391, but appears to be a possibly different cause.
3. nikomatsakis commented on Nov 14, 2013

   

   nikomatsakis

   on Nov 14, 2013

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   cc me. I've been negligent and not looked at #10391 yet, I'll see if I can peel off some time today to look at both of these.
4. nikomatsakis commented on Nov 15, 2013

   

   nikomatsakis

   on Nov 15, 2013

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   This is in fact a dup of #5121
5. nikomatsakis

   closed this as completedon Nov 15, 2013
6. nikomatsakis commented on Nov 15, 2013

   

   nikomatsakis

   on Nov 15, 2013

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   In particular we don't (yet) support a function like:

   fn cat_files<'self, T: Iterator<&'self ~str>>(_: &T) {}
   

   because 'self appears within the trait bound for T.
7. flip1995

   added a commit that references this issue on Mar 10, 2023

   Auto merge of rust-lang#10467 - blyxyas:underscore_typed, r=Jarcho

   ...

   5f98734
8. U007D

   added a commit that references this issue on Aug 21, 2026

   Merge rust-lang#10467

   ...

   fd3f4c5