yeet fast path

[lcnr]

Using tcx.is_copy_modulo_regions drops information from the current typing_env. Writing a regression test for this is really hard. We need to prove Copy of something that doesn't directly reference a coroutine or an opaque, but does so indirectly.

Fixes #146813.

[rustbot]

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[lcnr]

@bors try @rust-timer queue

[rust-timer]

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

[rust-log-analyzer]

The job aarch64-gnu-llvm-20-1 failed! Check out the build log: (web) (plain enhanced) (plain)

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To only update this specific test, also pass `--test-args lang-items/missing-copy-lang-item-issue-19660.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/lang-items/missing-copy-lang-item-issue-19660.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/lang-items/missing-copy-lang-item-issue-19660" "-A" "unused" "-A" "internal_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
error: requires `copy` lang_item

error: aborting due to 1 previous error

[rust-bors]

☀️ Try build successful (CI)
Build commit: 42c94cb (42c94cb36404561f642158badaaff2df4e506686, parent: f6092f224d2b1774b31033f12d0bee626943b02f)

[rust-timer]

Queued 42c94cb with parent f6092f2, future comparison URL.
There are currently 2 preceding artifacts in the queue.
It will probably take at least ~3.4 hours until the benchmark run finishes.