ICE on nightly 2017-11-07: casting *const i64 to *mut _

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$ rustc --version
rustc 1.23.0-nightly (ee2286149 2017-11-07)

$ uname -a
Darwin Jeehoon-Kangs-MacBook-Pro.local 16.7.0 Darwin Kernel Version 16.7.0: Thu Jun 15 17:36:27 PDT 2017; root:xnu-3789.70.16~2/RELEASE_X86_64 x86_64

minimal example: https://play.rust-lang.org/?gist=231bf59b18642fcaba9a939dd43c41d8&version=nightly

use std::ptr;

fn main() {
    let p1: *const i64 = ptr::null();
    let p2 = p1 as *mut _;
}

error message (from playground)

   Compiling playground v0.0.1 (file:///playground)
error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.23.0-nightly (ee2286149 2017-11-07) running on x86_64-unknown-linux-gnu

thread 'rustc' panicked at 'explicit panic', /checkout/src/librustc_typeck/check/cast.rs:108:17
note: Run with `RUST_BACKTRACE=1` for a backtrace.

error: Could not compile `playground`.

To learn more, run the command again with --verbose.

@plietar

bisect-rust says the regression is in commit dce604a PR #44295

cc @plietar @arielb1

The example on the playground now just reports an error instead of producing an ICE on stable and nightly, which I believe is working as intended.

   Compiling playground v0.0.1 (file:///playground)
error[E0641]: cannot cast to a pointer of an unknown kind
 --> src/main.rs:5:14
  |
5 |     let p2 = p1 as *mut _;
  |              ^^^^^^------
  |                    |
  |                    help: consider giving more type information
  |
  = note: The type information given here is insufficient to check whether the pointer cast is valid

error: aborting due to previous error

For more information about this error, try `rustc --explain E0641`.
error: Could not compile `playground`.

To learn more, run the command again with --verbose.

Thanks!!

@cramertj

Does this need a test? @cramertj

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ICE on nightly 2017-11-07: casting `const i64` to `mut _` #45872

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ICE on nightly 2017-11-07: casting *const i64 to *mut _ #45872

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est31 commented on Nov 8, 2017

zmt00 commented on Jun 1, 2018

jeehoonkang commented on Jun 1, 2018

est31 commented on Jun 1, 2018

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ICE on nightly 2017-11-07: casting `const i64` to `mut _` #45872