rustc 1.26.0 crashes when compiling some programs using impl Trait

[0x0blu]

While testing the new 1.26.0's impl Trait feature, there were some programs that caused rustc to stack overflow without very helpful error message

I tried this code:

use std::fmt::Debug;

fn gen() -> impl PartialOrd + Debug { 1 }

fn main() {
    let a = gen();

    println!("{:?}", a);
}

I expected to see this happen: the program compiles and just prints 1

Instead, this happened: rustc crashed with cryptic error message

Meta

rustc --version --verbose:

rustc 1.26.0 (a77568041 2018-05-07)
binary: rustc
commit-hash: a7756804103447ea4e68a71ccf071e7ad8f7a03e
commit-date: 2018-05-07
host: x86_64-apple-darwin
release: 1.26.0
LLVM version: 6.0

Backtrace:

cargo run --verbose:

   Compiling impl-trait v0.1.0 (file:///Users/blu/Documents/playground/impl-trait)
     Running `rustc --crate-name impl_trait src/main.rs --crate-type bin --emit=dep-info,link -C debuginfo=2 -C metadata=33cb8f6c497adcee -C extra-filename=-33cb8f6c497adcee --out-dir /Users/blu/Documents/playground/impl-trait/target/debug/deps -C incremental=/Users/blu/Documents/playground/impl-trait/target/debug/incremental -L dependency=/Users/blu/Documents/playground/impl-trait/target/debug/deps`

thread 'rustc' has overflowed its stack
fatal runtime error: stack overflow
error: Could not compile `impl-trait`.

Caused by:
  process didn't exit successfully: `rustc --crate-name impl_trait src/main.rs --crate-type bin --emit=dep-info,link -C debuginfo=2 -C metadata=33cb8f6c497adcee -C extra-filename=-33cb8f6c497adcee --out-dir /Users/blu/Documents/playground/impl-trait/target/debug/deps -C incremental=/Users/blu/Documents/playground/impl-trait/target/debug/incremental -L dependency=/Users/blu/Documents/playground/impl-trait/target/debug/deps` (signal: 6, SIGABRT: process abort signal)

[leoyvens]

Dupe of #49376

[0x0blu]

Well, I did not search for issues that old