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Format specifiers and runtime-logging macros die horribly with "use std::*;" #7838

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bblum opened this issue Jul 17, 2013 · 2 comments
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Format specifiers and runtime-logging macros die horribly with "use std::*;" #7838

bblum opened this issue Jul 17, 2013 · 2 comments
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A-syntaxext Area: Syntax extensions

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@bblum
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bblum commented Jul 17, 2013 

use std::*;

fn main() {
    println(fmt!("%s", "hello world"));
}

This innocent-looking hello world program emits a zillion horrible errors. Using error!() or fail!() is not pretty either.

horrible.rs:4:23: 4:30 error: unresolved import: could not find `unstable` in `std::std`.
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: use of undeclared module `::std::unstable::extfmt::rt`
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: `std::unstable::extfmt::rt::Conv` does not name a structure
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: unresolved import: could not find `unstable` in `std::std`.
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: use of undeclared module `::std::unstable::extfmt::rt`
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: unresolved name `std::unstable::extfmt::rt::flag_none`.
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: unresolved import: could not find `unstable` in `std::std`.
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: use of undeclared module `::std::unstable::extfmt::rt`
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: unresolved name `std::unstable::extfmt::rt::CountImplied`.
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: unresolved import: could not find `unstable` in `std::std`.
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: use of undeclared module `::std::unstable::extfmt::rt`
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: unresolved name `std::unstable::extfmt::rt::CountImplied`.
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: unresolved import: could not find `unstable` in `std::std`.
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: use of undeclared module `::std::unstable::extfmt::rt`
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: unresolved name `std::unstable::extfmt::rt::TyDefault`.
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: unresolved import: could not find `unstable` in `std::std`.
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: use of undeclared module `::std::unstable::extfmt::rt`
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
horrible.rs:4:23: 4:30 error: unresolved name `std::unstable::extfmt::rt::conv_str`.
horrible.rs:4     println(fmt!("%s", "hello"));
                                     ^~~~~~~
note: in expansion of fmt!
horrible.rs:4:12: 4:32 note: expansion site
error: aborting due to 18 previous errors
@alexcrichton
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Dup of #7580 (although it's not fail it's fmt)

@bblum
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bblum commented Jul 17, 2013

oops thanks

flip1995 pushed a commit to flip1995/rust that referenced this issue Oct 21, 2021
@bors
Auto merge of rust-lang#7838 - nhamovitz:trailing_zs_arr_wo_repr, r=M…
300b821 
…anishearth

Warn on structs with a trailing zero-sized array but no `repr` attribute

Closes rust-lang#2868

changelog: Implement ``[`trailing_empty_array`]``, which warns if a struct is defined where the last field is a zero-sized array but there are no `repr` attributes. Zero-sized arrays aren't very useful in Rust itself, so such a struct is likely being created to pass to C code or in some other situation where control over memory layout matters. Either way, a `repr` attribute is needed.
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