ICE in global_variable_set_init, at rust/rust-gcc.cc:1982

auto-reduced (treereduce-rust):

fn non_elidable<'a, 'b>(a: &'a u8, b: &'b u8) -> &'a u8 {
    a
}

static NON_ELIDABLE_FN: &fn(&u8, &u8) -> &u8 = &(non_elidable as fn(&u8, &u8) -> &u8);

original:

//~^ ERROR missing lifetime specifier [E0106]![allow(dead_code)]

fn non_elidable<'a, 'b>(a: &'a u8, b: &'b u8) -> &'a u8 {
    a
}

// the boundaries of elision
static NON_ELIDABLE_FN: &fn(&u8, &u8) -> &u8 =
//~^ ERROR missing lifetime specifier [E0106]
    &(non_elidable as fn(&u8, &u8) -> &u8);
    //~^ ERROR missing lifetime specifier [E0106]

fn main() {}

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

crab1: internal compiler error: in global_variable_set_init, at rust/rust-gcc.cc:1982
0x8606cf Backend::global_variable_set_init(Bvariable*, tree_node*)
	../../gcc/rust/rust-gcc.cc:1982
0xfd89fd Rust::Compile::CompileItem::visit(Rust::HIR::StaticItem&)
	../../gcc/rust/backend/rust-compile-item.cc:90
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 ICE with the reduced Rust input and command shown in the issue, then inspect global_variable_set_init at rust/rust-gcc.cc:1982 and its caller in backend/rust-compile-item.cc:90. Trace how the static function pointer is handled, and verify that compiling the input no longer aborts with an internal compiler error.