ICE in eval_component_reference, at rust/backend/rus... | Rust-GCC/gccrs

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auto-reduced (treereduce-rust):

//@compile-flags: -frust-incomplete-and-experimental-compiler-do-not-use -frust-crate-attr=no_core
const a: &str = "foo";
const b: *const u8 = c as *const u8;
const c: *const str = &a as *const str;

original:

const a: &str = "foo";
const b: *const u8 = c as *const u8; //~ ERROR casting
const c: *const str = &a as *const str; //~ ERROR casting

fn main() {
}

Version information:

c539964b8cc842e871d77b45150df6a5882335fb

Command:
/home/matthias/vcs/github/gccrs/gccrs-build/gcc/crab1 -frust-incomplete-and-experimental-compiler-do-not-use -frust-crate-attr=no_core -frust-crate-attr=feature(no_core)

Program output

crab1: internal compiler error: in eval_component_reference, at rust/backend/rust-constexpr.cc:1838
0x32edd17 internal_error(char const*, ...)
	../../gcc/diagnostic-global-context.cc:787
0xc847b9 fancy_abort(char const*, int, char const*)
	../../gcc/diagnostics/context.cc:1813
0x93070f eval_component_reference
	../../gcc/rust/backend/rust-constexpr.cc:1838
0x11f6247 eval_constant_expression
	../../gcc/rust/backend/rust-constexpr.cc:2419
0x11fc1ff eval_store_expression
	../../gcc/rust/backend/rust-constexpr.cc:2743
0x11f4646 eval_constant_expression
	../../gcc/rust/backend/rust-constexpr.cc:2254
0x11f557b eval_constant_expression
	../../gcc/rust/backend/rust-constexpr.cc:2181
0x11f5955 eval_statement_list
	../../gcc/rust/backend/rust-constexpr.cc:4877
0x11f5955 eval_constant_expression
	../../gcc/rust/backend/rust-constexpr.cc:2261
0x11f4951 eval_constant_expression
	../../gcc/rust/backend/rust-constexpr.cc:2265
0x11f30ed eval_call_expression
	../../gcc/rust/backend/rust-constexpr.cc:3762
0x11f4718 eval_constant_expression
	../../gcc/rust/backend/rust-constexpr.cc:2175
0x11f77b7 Rust::Compile::fold_expr(tree_node*)
	../../gcc/rust/backend/rust-constexpr.cc:618
0x120acac Rust::Compile::HIRCompileBase::compile_constant_item(unsigned int, Rust::TyTy::BaseType*, Rust::TyTy::BaseType*, Rust::Resolver::CanonicalPath const&, Rust::HIR::Expr&, unsigned long, unsigned long)
	../../gcc/rust/backend/rust-compile-base.cc:1017
0x11c893a Rust::Compile::CompileItem::visit(Rust::HIR::ConstantItem&)
	../../gcc/rust/backend/rust-compile-item.cc:127
0xedd1bb Rust::Compile::CompileItem::compile(Rust::HIR::Item*, Rust::Compile::Context*, Rust::TyTy::BaseType*, unsigned long)
	../../gcc/rust/backend/rust-compile-item.h:37
0xedd1bb Rust::Compile::CompileCrate::go()
	../../gcc/rust/backend/rust-compile.cc:49
0xedd1bb Rust::Compile::CompileCrate::Compile(Rust::HIR::Crate&, Rust::Compile::Context*)
	../../gcc/rust/backend/rust-compile.cc:42
0xecc57a Rust::Session::compile_crate(char const*)
	../../gcc/rust/rust-session-manager.cc:855
/home/matthias/vcs/github/gccrs/gccrs-build/gcc/crab1 /tmp/icemaker_global_tempdir.fj8QfFurbjWE/rustc_testrunner_tmpdir_reporting.qcqSbraFfXMM/mvce.rs -o/tmp/icemaker_global_tempdir.fj8QfFurbjWE/rustc_testrunner_tmpdir_reporting.qcqSbraFfXMM/binaryname -frust-incomplete-and-experimental-compiler-do-not-use -frust-crate-attr=no_core -frust-crate-attr=feature(no_core)
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

Start with the reduced Rust reproducer and inspect eval_component_reference in gcc/rust/backend/rust-constexpr.cc around lines 1832-1844. Run the provided crab1 command to reproduce the ICE, then trace the constant-expression evaluation shown in the backtrace. Done means the input no longer aborts in eval_component_reference and the original casting diagnostics are handled without an internal compiler error.

Written by the indexing model from the issue text.

ICE in eval_component_reference, at rust/backend/rust-constexpr.cc , const casting

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