segfault in `Rust::Compile::HIRCompileBase::coercion... | Rust-GCC/gccrs

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auto-reduced (treereduce-rust):

//@compile-flags: -frust-incomplete-and-experimental-compiler-do-not-use
static foo: [usize; 3] = [1, 2, 3];

static slice_1: &'static [usize] = &slice_2;
static slice_2: &'static [usize] = &foo;

original:

//@ build-pass
#![allow(dead_code)]
#![allow(dead_code)]


static foo: [usize; 3] = [1, 2, 3];

static slice_1: &'static [usize] = &slice_2;
static slice_2: &'static [usize] = &foo;

fn main() {}

Version information:

5dc8c4d20d62462ebce137c6e5146235ab9e9e2e

Command:
/home/matthias/vcs/github/gccrs/gccrs-build/gcc/crab1 -frust-incomplete-and-experimental-compiler-do-not-use

Program output

crab1: error: the value of ‘mvce::slice_2’ is not usable in a constant expression
crab1: internal compiler error: Segmentation fault
0x2fecaf8 internal_error(char const*, ...)
	../../gcc/diagnostic-global-context.cc:517
0x196d57f crash_signal
	../../gcc/toplev.cc:321
0xdbf8ad Rust::Compile::HIRCompileBase::coercion_site1(tree_node*, Rust::TyTy::BaseType*, Rust::TyTy::BaseType*, unsigned long, unsigned long)
	../../gcc/rust/backend/rust-compile.cc:86
0xdbfc78 Rust::Compile::HIRCompileBase::coercion_site1(tree_node*, Rust::TyTy::BaseType*, Rust::TyTy::BaseType*, unsigned long, unsigned long)
	../../gcc/rust/backend/rust-compile.cc:77
0xdbfc78 Rust::Compile::HIRCompileBase::coercion_site(unsigned int, tree_node*, Rust::TyTy::BaseType*, Rust::TyTy::BaseType*, unsigned long, unsigned long)
	../../gcc/rust/backend/rust-compile.cc:69
0x118eac2 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:891
0x115782c Rust::Compile::CompileItem::visit(Rust::HIR::StaticItem&)
	../../gcc/rust/backend/rust-compile-item.cc:61
0xdbeeeb Rust::Compile::CompileItem::compile(Rust::HIR::Item*, Rust::Compile::Context*, Rust::TyTy::BaseType*, unsigned long)
	../../gcc/rust/backend/rust-compile-item.h:37
0xdbeeeb Rust::Compile::CompileCrate::go()
	../../gcc/rust/backend/rust-compile.cc:48
0xdbeeeb Rust::Compile::CompileCrate::Compile(Rust::HIR::Crate&, Rust::Compile::Context*)
	../../gcc/rust/backend/rust-compile.cc:41
0xdb9970 Rust::Session::compile_crate(char const*)
	../../gcc/rust/rust-session-manager.cc:732
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 the backtrace entry point in gcc/rust/backend/rust-compile.cc, especially HIRCompileBase::coercion_site1. Run the provided crab1 command to reproduce the failure; done means the static-slice case no longer causes a segmentation fault or internal compiler error.

Written by the indexing model from the issue text.

segfault in `Rust::Compile::HIRCompileBase::coercion_site1`, static slices

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