Macros cause rustc to stack overflow

[vcfxb]

example source code

I made an issue on the rust repository as well, but I figured I'd mention it here too -- for APIs with large schemas or queries that use large/deep input types, rustc to overflow:

$ RUST_BACKTRACE=1 cargo +stable build
   Compiling rustc-stack-overflow v0.1.0 (/home/antonia/Desktop/Projects/rustc-stack-overflow)

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

Caused by:
  process didn't exit successfully: `rustc --crate-name rustc_stack_overflow --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=20441d2a475a112e -C extra-filename=-20441d2a475a112e --out-dir /home/antonia/Desktop/Projects/rustc-stack-overflow/target/debug/deps -C incremental=/home/antonia/Desktop/Projects/rustc-stack-overflow/target/debug/incremental -L dependency=/home/antonia/Desktop/Projects/rustc-stack-overflow/target/debug/deps --extern graphql_client=/home/antonia/Desktop/Projects/rustc-stack-overflow/target/debug/deps/libgraphql_client-63af0a9b9458de3b.rlib` (signal: 6, SIGABRT: process abort signal)

[vcfxb]

Based on discussion on rust-lang/rust#86556 it seems that
this function recurses infinitely in this case.

[vcfxb]

This appears to be fixed in the 0.10.0 release. Closing issue!