Printing a parsed Expr hits unreachable!() without "full" feature #1868
Description
This panics in the to_token_stream call when syn is built with just default features. I probably shouldn't be trying to parse expressions without the "full" feature, but I assume this should be failing to parse instead.
use quote::ToTokens;
use syn::{Expr, parse_quote};
fn main() {
let e: Expr = parse_quote! { &() };
e.to_token_stream();
}thread 'main' panicked at ~/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.101/src/expr.rs:3262:18:
internal error: entered unreachable code
stack backtrace:
0: __rustc::rust_begin_unwind
at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/std/src/panicking.rs:697:5
1: core::panicking::panic_fmt
at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/core/src/panicking.rs:75:14
2: core::panicking::panic
at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/core/src/panicking.rs:145:5
3: syn::expr::printing::print_expr::{{closure}}
at ~/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.101/src/expr.rs:3262:18
4: syn::expr::printing::print_expr
at ~/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.101/src/expr.rs:3268:13
5: syn::expr::printing::print_subexpression::{{closure}}
at ~/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.101/src/expr.rs:3174:56
6: syn::expr::printing::print_subexpression
at ~/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.101/src/expr.rs:3179:13
7: syn::expr::printing::print_expr_reference
at ~/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.101/src/expr.rs:3847:9
8: syn::expr::printing::<impl quote::to_tokens::ToTokens for syn::expr::ExprReference>::to_tokens
at ~/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.101/src/expr.rs:3834:13
9: <syn::expr::Expr as quote::to_tokens::ToTokens>::to_tokens
at ~/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.101/src/macros.rs:124:68
10: quote::to_tokens::ToTokens::to_token_stream
at ~/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/quote-1.0.40/src/to_tokens.rs:58:9