ICE: Yet another bug looks like #49470

[3442853561]

I'm not sure if the cause of this problem is exactly the same as #49470

fn main() -> Result<(), Box<Option<&'static str>>> {
    Err(Box::new(None))
}

and I got that:

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 1.26.0-nightly (e5277c145 2018-03-28) running on x86_64-unknown-linux-gnu
note: compiler flags: -C codegen-units=1 -C debuginfo=2 --crate-type bin
note: some of the compiler flags provided by cargo are hidden

[3442853561]

And I can not compiled this yet

fn main() -> Result<(), Option<&'static str>> {
    Err(None)
}

I got that:

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 1.26.0-nightly (e5277c145 2018-03-28) running on x86_64-unknown-linux-gnu
note: compiler flags: -C codegen-units=1 -C debuginfo=2 --crate-type bin
note: some of the compiler flags provided by cargo are hidden

[3442853561]

And this:

fn main() -> Result<(), &'static str> {
    Err("Fish Leong gave me courage")
}

And I got some same notes

[3442853561]

I'm not sure if the cause of this problem is exactly the same as #49470
Because when #49470 remove the Box it could run
however this issue can not

[sinkuu]

This seems to be indeed a duplication of #48890 (all examples compile fine now), so you can close this.