Unexpected panic when building with WebAssembly #47643

extern crate lazy_static;

export RUST_BACKTRACE=1 && cargo build --example wasm --target wasm32-unknown-unknown

rustc 1.25.0-nightly (15a1e2844 2018-01-20)
binary: rustc
commit-hash: 15a1e2844dfea7850be5c6c901b67ceff370b0eb
commit-date: 2018-01-20
host: x86_64-unknown-linux-gnu
release: 1.25.0-nightly
LLVM version: 4.0

thread 'rustc' panicked at 'assertion failed: `(left == right)`
  left: `2`,
 right: `1`', librustc_trans/back/link.rs:1403:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
	     at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::print
	     at libstd/sys_common/backtrace.rs:68
	     at libstd/sys_common/backtrace.rs:57
   2: std::panicking::default_hook::{{closure}}
	     at libstd/panicking.rs:380
   3: std::panicking::default_hook
	     at libstd/panicking.rs:390
   4: std::panicking::rust_panic_with_hook
	     at libstd/panicking.rs:576
   5: std::panicking::begin_panic
	     at libstd/panicking.rs:537
   6: std::panicking::begin_panic_fmt
	     at libstd/panicking.rs:521
   7: rustc_trans::back::link::link_natively
   8: rustc_trans::back::link::link_binary
   9: <rustc_trans::LlvmTransCrate as rustc_trans_utils::trans_crate::TransCrate>::link_binary
  10: rustc_driver::driver::compile_input
  11: rustc_driver::run_compiler

error: Could not compile `minifb`.