nightly: Linker error / wasm-bindgen pulling in env library in generated JS

[TimJentzsch]

See bevyengine/bevy#19225.

On Bevy, we have run into an issue on nightly where we either get a linker error or invalid bindings with wasm-bindgen.

Linker error on native

   Compiling bug_wasm-bindgen_env v0.1.0 (/home/tim/dev/bug_wasm-bindgen_env)
error: linking with `clang` failed: exit status: 1
  |
  = note:  "clang" "-m64" "/tmp/rustchNoW7Y/symbols.o" "<9 object files omitted>" "-Wl,--as-needed" "-Wl,-Bstatic" "/home/tim/dev/bug_wasm-bindgen_env/target/debug/deps/{libbevy-ef0075a494fc9a41.rlib,libbevy_internal-c2bcb90895ea819c.rlib,libbevy_core_pipeline-bab6b10223073b9b.rlib,libradsort-6329291d828cca19.rlib,libbevy_render-9a077a73871d3ec8.rlib,libnaga_oil-81aa3be42d198123.rlib,libdata_encoding-4734587c2136160c.rlib,libunicode_ident-54469ad67d8d644e.rlib,liboffset_allocator-0e824df91134ebd0.rlib,libbevy_mesh-6fda00499cbe02fd.rlib,libbevy_mikktspace-5aa232ba0ad0d418.rlib,libhexasphere-dccbf6cde1886eb0.rlib,libconstgebra-714585bddf9ce304.rlib,libconst_soft_float-7f2e0915060da76e.rlib,libbevy_diagnostic-e5c3c88f1d96f8ee.rlib,libbevy_time-38fe796ed0940269.rlib,libconst_fnv1a_hash-77eb2fa24874ff2a.rlib,libbevy_window-ed83a6b52bad542f.rlib,libbevy_input-e411114b3b15b3a9.rlib,libbevy_transform-1726a6fe3ced9881.rlib,libbevy_log-66c11619c9d13ab4.rlib,libtracing_subscriber-3170deef8cfa84fa.rlib,libsharded_slab-656e8964720dc0fd.rlib,liblazy_static-0af248c60e3341bb.rlib,libmatchers-1aa9e22010a9f7ef.rlib,libregex_automata-e57c4be15c22dcee.rlib,libregex_syntax-ffe6f02b7f9724aa.rlib,libregex-a4eefe4ee24ebca2.rlib,libregex_automata-7c4763cfbfcbff74.rlib,libaho_corasick-b4415a5282eb66c7.rlib,libmemchr-65c39dbadf63ffa7.rlib,libregex_syntax-270303fda92effcb.rlib,libnu_ansi_term-955034470a1d261d.rlib,liboverload-813976810a62da31.rlib,libtracing_log-e3e4481d2e6d5b92.rlib,libbevy_image-6d74ab3cefb47b1a.rlib,libruzstd-6b1582d7da8d6795.rlib,libtwox_hash-b5c53df6ea70d1da.rlib,libhalf-dc1846b96aad7308.rlib,libimage-cde913bf557c7121.rlib,libbyteorder_lite-7729a87c995421d4.rlib,librectangle_pack-ea1a6d48f5d84f98.rlib,libktx2-b550a1512a83b20e.rlib,libbitflags-688de6b475a0b73d.rlib,libguillotiere-de16af04330aefd6.rlib,libsvg_fmt-1aadd9587fac8a01.rlib,libeuclid-34ec3713a2eba5f9.rlib,libwgpu-5113bbe4bb20ddf5.rlib,libstatic_assertions-8294e59c87507aae.rlib,libwgpu_core-324a98183b6d8113.rlib,libwgpu_hal-42a3d97ae113a4f8.rlib,librenderdoc_sys-f9b7126daa7a3d62.rlib,libkhronos_egl-41bc52b539257aa1.rlib,libprofiling-f51f7ad8ebd14960.rlib,libordered_float-3ae115dde9cfd386.rlib,libgpu_descriptor-a1353172de2b80a1.rlib,libgpu_descriptor_types-b4275cb8d16aa4c9.rlib,libgpu_alloc-b1dc718e41164744.rlib,libgpu_alloc_types-b5bb98b30212b52a.rlib,libash-38259bfb3a66c7d6.rlib,liblibloading-946316b210ef23e9.rlib,libnaga-c97e46432f14f734.rlib,librustc_hash-0f7bf4aa538a7118.rlib,libhexf_parse-c910edf68332a273.rlib,libunicode_xid-1a03320b44bbbc72.rlib,libbit_set-ef0c96be94aae5c1.rlib,libbit_vec-8a8b48c5ffe3bb87.rlib,libstrum-149823e023935f52.rlib,libcodespan_reporting-ac874c2c7e35c707.rlib,libunicode_width-13d7d876a11a147c.rlib,libtermcolor-f796f917ac4f0785.rlib,libspirv-9137f97759907312.rlib,libglow-c975fff40b5c26e1.rlib,libraw_window_handle-2ff942af3b0fe117.rlib,libbevy_asset-8c1708478ce03395.rlib,libblake3-67f47cfeedc6e0dd.rlib,libconstant_time_eq-88724876ad2013f3.rlib,libarrayvec-12e3b0cc34d592f4.rlib,libarrayref-b0edf9d0a1b3f42e.rlib,libasync_broadcast-6d1d3e0157b78f91.rlib,libasync_fs-5fcdcf5286892404.rlib,libblocking-e5007c5eb4cd7b24.rlib,libpiper-8af838fb393a3ca9.rlib,libatomic_waker-34fbabedd9c5c617.rlib,libasync_channel-463532a9589418f2.rlib,libron-ab2139fe4b2af294.rlib,libbase64-8d4296a2c510f17a.rlib,libstackfuture-d99fdcf773f7df88.rlib,libatomicow-890fdacc118e22ae.rlib,libasync_lock-592afffa317dc612.rlib,libevent_listener_strategy-a9f15f412c785eaa.rlib,libevent_listener-2cfefdb77d4b8f52.rlib,libparking_lot-1208259ea968fe0a.rlib,libparking_lot_core-da09f58d79728360.rlib,liblock_api-d48de99c4c05fa58.rlib,libscopeguard-8243eeae16d7eb0a.rlib,libcrossbeam_channel-1889265b6329594b.rlib,libtracing-e6f54618678a0e5f.rlib,libtracing_core-a2b382a8e55f99c0.rlib,libbevy_color-ef2b181f3373ee28.rlib,libencase-6c7024347c1eab32.rlib,libconst_panic-f15ef77cecaf1b17.rlib,libthiserror-34da62fd789710cb.rlib,libwgpu_types-47a6c11751931435.rlib,libbevy_math-a86942e8ea2cd0b2.rlib,librand_distr-c384ce303cf43c9f.rlib,libnum_traits-f063ebf7679bdb38.rlib,libitertools-38ce46052fb01b62.rlib,libeither-12a5559181fe8091.rlib,libbevy_app-145e9bdd29a8a373.rlib,libctrlc-cbf6fce545802a17.rlib,libnix-b2e3736a2f91d1b9.rlib,libbevy_ecs-fbd297d7b6497cb5.rlib,libbitflags-0337ea3f28e745e0.rlib,libnonmax-7b4bfdb8bea0b3f6.rlib,libbevy_tasks-3bed577ff3c50da6.rlib,libasync_executor-7f3061b112beac16.rlib,libslab-c60455d8a08412c4.rlib,libconcurrent_queue-782e5f3de4c9e6c2.rlib,libcrossbeam_utils-9825ba4b5b6a119f.rlib,libasync_task-b88a0a410f3f7c16.rlib,libfutures_lite-06ca46672ca43d3c.rlib,libfutures_io-79115c52a099b19e.rlib,libfutures_core-de705675c4dbc62b.rlib,libparking-71d690fe5a098fdf.rlib,libfastrand-aaecaa6ded02aab3.rlib,libpin_project_lite-cb87049b5092e64c.rlib,libfixedbitset-981d4f7d025c5793.rlib,liblog-2a054680744da8c1.rlib,libindexmap-127951a1f1048a30.rlib,libbumpalo-ccc5e3f4cba5df6e.rlib,libdisqualified-3e561cd156bc4705.rlib,libbevy_reflect-d03a55c4d0c690a5.rlib,libuuid-00f3208ddf8d7f16.rlib,libgetrandom-1927210e6d7b8c46.rlib,libsmol_str-3cbd9290031892b9.rlib,liberased_serde-3548ea0717f46b74.r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"<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib/{libstd-*,libpanic_unwind-*,libobject-*,libmemchr-*,libaddr2line-*,libgimli-*,librustc_demangle-*,libstd_detect-*,libhashbrown-*,librustc_std_workspace_alloc-*,libminiz_oxide-*,libadler2-*,libunwind-*,libcfg_if-*,liblibc-*,liballoc-*,librustc_std_workspace_core-*,libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-ldl" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-L" "/tmp/rustchNoW7Y/raw-dylibs" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/home/tim/dev/bug_wasm-bindgen_env/target/debug/build/blake3-bfe811c77feedc28/out" "-L" "/home/tim/dev/bug_wasm-bindgen_env/target/debug/build/blake3-bfe811c77feedc28/out" "-L" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/home/tim/dev/bug_wasm-bindgen_env/target/debug/deps/bug_wasm_bindgen_env-3f186b0f5b6b56a4" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs" "-fuse-ld=/usr/bin/mold"
  = note: some arguments are omitted. use `--verbose` to show all linker arguments
  = note: mold: error: undefined symbol: /home/tim/dev/bug_wasm-bindgen_env/target/debug/deps/libbevy_core_pipeline-bab6b10223073b9b.rlib(bevy_core_pipeline-bab6b10223073b9b.bevy_core_pipeline.6683a2557f8da2a7-cgu.12.rcgu.o): _$LT$bevy_render..view..ViewDepthTexture$u20$as$u20$bevy_ecs..component..Component$GT$::clone_behavior::hf37de333d534ddb3
          mold: error: undefined symbol: /home/tim/dev/bug_wasm-bindgen_env/target/debug/deps/libbevy_core_pipeline-bab6b10223073b9b.rlib(bevy_core_pipeline-bab6b10223073b9b.bevy_core_pipeline.6683a2557f8da2a7-cgu.12.rcgu.o): _$LT$bevy_render..experimental..occlusion_culling..OcclusionCullingSubview$u20$as$u20$bevy_ecs..component..Component$GT$::clone_behavior::h57f403d5f2a476c2
          mold: error: undefined symbol: /home/tim/dev/bug_wasm-bindgen_env/target/debug/deps/libbevy_core_pipeline-bab6b10223073b9b.rlib(bevy_core_pipeline-bab6b10223073b9b.bevy_core_pipeline.6683a2557f8da2a7-cgu.12.rcgu.o): _$LT$bevy_render..view..ViewDepthTexture$u20$as$u20$bevy_ecs..component..Component$GT$::register_required_components::h25a6cf8a4a8744b4
          mold: error: undefined symbol: /home/tim/dev/bug_wasm-bindgen_env/target/debug/deps/libbevy_core_pipeline-bab6b10223073b9b.rlib(bevy_core_pipeline-bab6b10223073b9b.bevy_core_pipeline.6683a2557f8da2a7-cgu.12.rcgu.o): _$LT$bevy_render..experimental..occlusion_culling..OcclusionCullingSubview$u20$as$u20$bevy_ecs..component..Component$GT$::register_required_components::h2080aeda89222a9d
          clang: error: linker command failed with exit code 1 (use -v to see invocation)
          

error: could not compile `bug_wasm-bindgen_env` (bin "bug_wasm-bindgen_env") due to 1 previous error

Invalid bindings created by wasm-bindgen:

import * as __wbg_star0 from 'env';

So it's trying to import from an env package that doesn't exist.

I cannot reproduce the issue on beta or stable toolchains, not sure if this indicates a bug in the compiler.
We discovered that nightly 2025-05-14 still works, hopefully that helps to track down the issue.

To reproduce, see this repository: https://github.com/TimJentzsch/bug_wasm-bindgen_env
It includes scripts to reproduce the error.
I tried to minimize it as much as I could.

Meta

rustc --version --verbose:

rustc 1.89.0-nightly (d97326eab 2025-05-15)
binary: rustc
commit-hash: d97326eabfc3b2c33abcb08d6bc117aefa697cb7
commit-date: 2025-05-15
host: x86_64-unknown-linux-gnu
release: 1.89.0-nightly
LLVM version: 20.1.4

This bug report was brought to you by RustWeek 2025.
If you're at the venue, come talk to me in the Bevy unconf room!

[workingjubilee]

I wonder if this is wasm-bindgen reacting to some change in std or something...

[TimJentzsch]

We discovered that wasm-bindgen is not required to reproduce the issue, on native we get a linker error.
I updated the reproduction repo with our findings.

Additionally, we found that the error is not present with nightly 2025-05-14.

[workingjubilee]

It does not repro on the latest nightly.

Original regression

searched nightlies: from nightly-2025-05-14 to nightly-2025-05-17
regressed nightly: nightly-2025-05-16
searched commit range: 414482f...d97326e
regressed commit: c4e05e5

• PR: Use the new solver in the impossible_predicates #136988

Unregression

searched nightlies: from nightly-2025-05-16 to nightly-2025-05-29
regressed nightly: nightly-2025-05-18
searched commit range: 16d2276...777d372
regressed commit: bf5a38d

• PR: Only select true errors in impossible_predicates #141121

Resolved.