Fix ICE when multiple supertrait substitutions need assoc but only one is provided

[compiler-errors]

I'll write more here when the crate run is done.

Fixes #133388

r? lcnr
@rustbot author

[rustbot]

changes to the core type system

cc @compiler-errors, @lcnr

HIR ty lowering was modified

cc @fmease

[compiler-errors]

@bors try

[bors]

⌛ Trying commit 8a10f68 with merge c7377f6...

[rust-log-analyzer]

The job x86_64-gnu-llvm-18 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

#16 exporting to docker image format
#16 sending tarball 28.2s done
#16 DONE 30.8s
##[endgroup]
Setting extra environment values for docker:  --env ENABLE_GCC_CODEGEN=1 --env GCC_EXEC_PREFIX=/usr/lib/gcc/
[CI_JOB_NAME=x86_64-gnu-llvm-18]
debug: `DISABLE_CI_RUSTC_IF_INCOMPATIBLE` configured.
---
sccache: Starting the server...
##[group]Configure the build
configure: processing command line
configure: 
configure: build.configure-args := ['--build=x86_64-unknown-linux-gnu', '--llvm-root=/usr/lib/llvm-18', '--enable-llvm-link-shared', '--set', 'rust.randomize-layout=true', '--set', 'rust.thin-lto-import-instr-limit=10', '--enable-verbose-configure', '--enable-sccache', '--disable-manage-submodules', '--enable-locked-deps', '--enable-cargo-native-static', '--set', 'rust.codegen-units-std=1', '--set', 'dist.compression-profile=balanced', '--dist-compression-formats=xz', '--set', 'rust.lld=false', '--disable-dist-src', '--release-channel=nightly', '--enable-debug-assertions', '--enable-overflow-checks', '--enable-llvm-assertions', '--set', 'rust.verify-llvm-ir', '--set', 'rust.codegen-backends=llvm,cranelift,gcc', '--set', 'llvm.static-libstdcpp', '--enable-new-symbol-mangling']
configure: target.x86_64-unknown-linux-gnu.llvm-config := /usr/lib/llvm-18/bin/llvm-config
configure: llvm.link-shared     := True
configure: rust.randomize-layout := True
configure: rust.thin-lto-import-instr-limit := 10
---
  Downloaded boml v0.3.1
   Compiling boml v0.3.1
   Compiling y v0.1.0 (/checkout/compiler/rustc_codegen_gcc/build_system)
    Finished `release` profile [optimized] target(s) in 3.99s
     Running `/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-codegen/x86_64-unknown-linux-gnu/release/y test --use-system-gcc --use-backend gcc --out-dir /checkout/obj/build/x86_64-unknown-linux-gnu/stage1-tools/cg_gcc --release --mini-tests --std-tests`
Using system GCC
[BUILD] example
[AOT] mini_core_hello_world
/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-tools/cg_gcc/mini_core_hello_world
abc
---
---- [ui] tests/rustdoc-ui/unable-fulfill-trait.rs stdout ----
Saved the actual stderr to "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc-ui/unable-fulfill-trait/unable-fulfill-trait.stderr"
diff of stderr:

14 LL |     field1: dyn Bar<'a, 'b, U>,
16 
- error[E0227]: ambiguous lifetime bound, explicit lifetime bound required
-   --> $DIR/unable-fulfill-trait.rs:4:13
-    |
-    |
- LL |     field1: dyn Bar<'a, 'b>,
+ error: aborting due to 1 previous error
22 
- error: aborting due to 2 previous errors
- 
---
To only update this specific test, also pass `--test-args unable-fulfill-trait.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/x86_64-unknown-linux-gnu/stage2/bin/rustdoc" "/checkout/tests/rustdoc-ui/unable-fulfill-trait.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/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--check-cfg" "cfg(FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc-ui/unable-fulfill-trait" "-A" "internal_features" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers"
--- stderr -------------------------------
error[E0107]: trait takes 1 generic argument but 0 generic arguments were supplied
##[error]  --> /checkout/tests/rustdoc-ui/unable-fulfill-trait.rs:4:17
   |
   |
LL |     field1: dyn Bar<'a, 'b>,
   |                 ^^^ expected 1 generic argument
note: trait defined here, with 1 generic parameter: `U`
  --> /checkout/tests/rustdoc-ui/unable-fulfill-trait.rs:9:11
   |
   |
LL | pub trait Bar<'x, 's, U>
help: add missing generic argument
   |
   |
LL |     field1: dyn Bar<'a, 'b, U>,

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0107`.

[bors]

☀️ Try build successful - checks-actions
Build commit: c7377f6 (c7377f633f2c785ef968ab6517e5218297777ae5)

[compiler-errors]

@craterbot check

[craterbot]

👌 Experiment pr-133392 created and queued.
🤖 Automatically detected try build c7377f6
🔍 You can check out the queue and this experiment's details.

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