ICE on stable: Proc macro attribute usage with lazy_static

[RustyYato]

Code:
Main crate:

use lazy_static::lazy_static;

#[telem_start::start]
fn main() {
    
}

Proc Macro Crate (telem_start)

extern crate proc_macro;

use proc_macro::TokenStream;
use quote::quote;

use syn::Item;
use syn::spanned::Spanned;

#[proc_macro_attribute]
pub fn start(attr: TokenStream, item: TokenStream) -> TokenStream {
    let item: Item = syn::parse(item).unwrap();
    
    let mut start_fn = if let Item::Fn(item) = item {
        item
    } else {
        panic!()
    };

    let mut block = start_fn.block;

    let stmt: syn::Stmt = syn::parse((quote! {
        lazy_static! { static ref __telem_core__start_time: std::time::Instant = { std::time::Instant::now() }; }
    }).into()).unwrap();

    block.stmts = std::iter::once(stmt).chain(block.stmts).collect();
    start_fn.block = block;

    (quote! {
        #start_fn
    }).into()
}

Backtrace

error: internal compiler error: src\librustc\dep_graph\graph.rs:610: DepNode Hir(d73c6af366f2c00f-293f1afd29c872f8) should have been pre-allocated but wasn't.

thread 'rustc' panicked at 'Box<Any>', src\librustc_errors\lib.rs:588:9
stack backtrace:
   0: std::sys_common::alloc::realloc_fallback
   1: std::panicking::take_hook
   2: std::panicking::take_hook
   3: rustc::ty::trait_def::TraitDef::ancestors
   4: std::panicking::rust_panic_with_hook
   5: <rustc_errors::emitter::ColorConfig as core::fmt::Debug>::fmt
   6: rustc_errors::Handler::bug
   7: rustc::util::bug::bug_fmt
   8: rustc::ty::context::<impl rustc::infer::canonical::Canonical<'gcx, rustc::ty::context::UserTypeAnnotation<'gcx>>>::is_identity
   9: rustc::ty::context::<impl rustc::infer::canonical::Canonical<'gcx, rustc::ty::context::UserTypeAnnotation<'gcx>>>::is_identity
  10: rustc::ty::context::<impl rustc::infer::canonical::Canonical<'gcx, rustc::ty::context::UserTypeAnnotation<'gcx>>>::is_identity
  11: rustc::util::bug::bug_fmt
  12: rustc::util::bug::bug_fmt
  13: rustc::dep_graph::graph::DepGraph::try_mark_green
  14: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_mark_green_and_read
  15: <rustc_typeck::check::Diverges as core::fmt::Debug>::fmt
  16: <rustc_typeck::variance::terms::InferredIndex as core::fmt::Debug>::fmt
  17: rustc_typeck::check_crate
  18: <rustc_driver::profile::trace::Query as core::fmt::Debug>::fmt
  19: rustc_driver::target_features::add_configuration
  20: rustc_driver::driver::compile_input
  21: rustc_driver::run_compiler
  22: <rustc_driver::CompilationFailure as core::fmt::Debug>::fmt
  23: rustc_driver::run_compiler
  24: <rustc_driver::CompilationFailure as core::fmt::Debug>::fmt
  25: <rustc_driver::profile::trace::Query as core::fmt::Debug>::fmt
  26: _rust_maybe_catch_panic
  27: <humantime::date::Error as std::error::Error>::cause
  28: std::sys::windows::thread::Thread::new
  29: BaseThreadInitThunk
  30: RtlUserThreadStart
query stack during panic:
end of query stack
error: aborting due to previous error

[RustyYato]

Note:

If I change

use lazy_static::lazy_static;

to

#[macro_use]
extern crate lazy_static;

It compiles fine

[RustyYato]

After doing a clean build, I am no longer able to reproduce the ICE

[jonas-schievink]

Sounds like an incr. comp. issue anyhow

[RustyYato]

Ok, I want to give what information I was able to find

[jonas-schievink]

Yeah, these issues are just really hard to track down. If you find a way to reproduce this, please post it here.

[RustyYato]

Ok

[hellow554]

@KrishnaSannasi can you try renaming a variable between two builds? I had a similar issue with the same error message: #57692

You may want to verify, that it worked with nightly-2019-01-20 -ish

[RustyYato]

I am no longer able to reproduce the issue after a clean build, so I don't know. Although, if a clean build did fix the issue, then it may be related to incremental compilation.

---

also changing use lazy_static::lazy_static to #[macro_use] extern crate lazy_static; did get rid of the ICE, and this seems similar to changing names, at least on the surface.

[jonas-schievink]

I just hit this, also using a proc macro with lazy_static. I moved my incremental dir, which stopped the ICE. Unfortunately moving it back for some reason no longer reproduces the problem.