thread 'rustc' has overflowed its stack (when using #[derive(serde::Deserialize)] inside a custom Deserialize impl)

[moxian]

Code

struct AB {}

impl<'de> serde::Deserialize<'de> for AB {
    fn deserialize<D>(_deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        #[derive(serde::Deserialize)]  // comment this out to fix the stack overflow
        struct A2 {}
        
        return Ok(AB{})
    }
}

fn main(){}

playground: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=8bfc3b0d3b728b256df33a4db645302c

Meta

rustc --version --verbose:

rustc 1.50.0-beta.5 (ff5998292 2021-01-05)
binary: rustc
commit-hash: ff59982926d98c8508008f0559f8a055260ac05e
commit-date: 2021-01-05
host: x86_64-pc-windows-msvc
release: 1.50.0-beta.5

(but also present in stable and nightly)

Error output

thread 'rustc' has overflowed its stack
fatal runtime error: stack overflow
error: could not compile `playground`

[dillona]

cargo-bisect-rustc points to the following commits:

found 6 bors merge commits in the specified range
  commit[0] 2020-04-26UTC: Auto merge of #71593 - Dylan-DPC:rollup-ms7j94u, r=Dylan-DPC
  commit[1] 2020-04-26UTC: Auto merge of #71468 - matthiaskrgr:submodule_upd, r=Dylan-DPC
  commit[2] 2020-04-27UTC: Auto merge of #71600 - Dylan-DPC:rollup-7tvzi9n, r=Dylan-DPC
  commit[3] 2020-04-27UTC: Auto merge of #70073 - wesleywiser:mir_opt_level_0, r=oli-obk
  commit[4] 2020-04-27UTC: Auto merge of #71268 - estebank:devectorize, r=eddyb
  commit[5] 2020-04-27UTC: Auto merge of #71200 - oli-obk:mir_bless, r=eddyb

[apiraino]

Assigning P-medium as discussed as part of the Prioritization Working Group procedure and removing I-prioritize.

[zugzwang]

Without commenting the derive line, the stack overflow also gets fixed if the definition of A2 gets moved out of the impl scope

Playground: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=3caf353743fc1625b02f50933b6fd348

[dtolnay]

Closing as a duplicate of #55779.