ICE in fold_convert_loc, at fold-const.cc:2633

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auto-reduced (treereduce-rust):

fn main() {
    let x: &[isize] = &[1, 2, 3];
    let y: &u32 = (&x) as &'static u32;
}

original:

#![allow(warnings)]

fn main() {
    let x: &[isize] = &[1, 2, 3];
    let y: &u32 = (&x) as &'static u32; //~ ERROR `x` does not live long enough
}

Version information:

a988708b4ba2b5a27715ea34c09ccfd3ed5143ca

Command:
crab1 -Warray-bounds -mtune=generic -march=x86-64 -O0 -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib64 -frust-incomplete-and-experimental-compiler-do-not-use

Program output

crab1: internal compiler error: in fold_convert_loc, at fold-const.cc:2633
0x8b2af4 fold_convert_loc(unsigned int, tree_node*, tree_node*)
	../../gcc/fold-const.cc:2633
0xfe2d03 ???
	../../gcc/rust/backend/rust-compile-expr.h:47
0xfe0c20 Rust::Compile::CompileExpr::Compile(Rust::HIR::Expr&, Rust::Compile::Context*)
	../../gcc/rust/backend/rust-compile-expr.cc:47
0xfdbb71 Rust::Compile::CompileStmt::visit(Rust::HIR::LetStmt&)
	../../gcc/rust/backend/rust-compile-stmt.cc:71
0xfdbd8d Rust::Compile::CompileStmt::Compile(Rust::HIR::Stmt*, Rust::Compile::Context*)
	../../gcc/rust/backend/rust-compile-stmt.cc:36
0x100c05b Rust::Compile::HIRCompileBase::compile_function_body(tree_node*, Rust::HIR::BlockExpr&, Rust::TyTy::BaseType*)
	../../gcc/rust/backend/rust-compile-base.cc:579
0x100fb8c Rust::Compile::HIRCompileBase::compile_function(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Rust::HIR::SelfParam&, std::vector<Rust::HIR::FunctionParam, std::allocator<Rust::HIR::FunctionParam> >&, Rust::HIR::FunctionQualifiers const&, Rust::HIR::Visibility&, std::vector<Rust::AST::Attribute, std::allocator<Rust::AST::Attribute> >&, unsigned int, Rust::HIR::BlockExpr*, Rust::Resolver::CanonicalPath const&, Rust::TyTy::FnType*)
	../../gcc/rust/backend/rust-compile-base.cc:761
0xfd7c2d Rust::Compile::CompileItem::visit(Rust::HIR::Function&)
	../../gcc/rust/backend/rust-compile-item.cc:256
0xc64954 Rust::Compile::CompileItem::compile(Rust::HIR::Item*, Rust::Compile::Context*, Rust::TyTy::BaseType*, unsigned int)
	../../gcc/rust/backend/rust-compile-item.h:37
0xc64954 Rust::Compile::CompileCrate::go()
	../../gcc/rust/backend/rust-compile.cc:48
0xc64a3b Rust::Compile::CompileCrate::Compile(Rust::HIR::Crate&, Rust::Compile::Context*)
	../../gcc/rust/backend/rust-compile.cc:41
0xc5c44b Rust::Session::compile_crate(char const*)
	../../gcc/rust/rust-session-manager.cc:733
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.

Reproduce the reduced Rust case with the reported crab1 command, then start at gcc/rust/backend/rust-compile-expr.h:47 and rust-compile-expr.cc:47, using the fold-const.cc:2633 frame to trace the failing conversion. Done means this input no longer triggers an internal compiler error while preserving the reported diagnostic behavior.

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