x86128

#include <coroutine>

struct task {
    struct promise_type {
        task get_return_object() { return {}; }
        std::suspend_never initial_suspend() { return {}; }
        std::suspend_never final_suspend() noexcept { return {}; }
        void return_value(int) {}
        void unhandled_exception() {}
    };
    bool await_ready() { return true; }
    void await_suspend(std::coroutine_handle<>) {}
    int await_resume() { return 0; }
};

task f()
{
    int n = ({
        if (co_await task{})
            co_return 1;
        0;
    });
    co_return n;
}

$ gcc -std=c++20 -c bug.cpp 
bug.cpp: In function ‘void f(_Z1fv.Frame*)’:
bug.cpp:20:13: internal compiler error: in gimplify_expr, at gimplify.cc:21341
   20 |             co_return 1;
      |             ^~~~~~~~~
0x178129e internal_error(char const*, ...)
	../../src/gcc/diagnostic-global-context.cc:787
0x1786059 fancy_abort(char const*, int, char const*)
	../../src/gcc/diagnostics/context.cc:1813
0x7fcadc gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*), int)
	../../src/gcc/gimplify.cc:21341
0x1ae7c77 gimplify_stmt(tree_node**, gimple**)
	../../src/gcc/gimplify.cc:8686
0x1ae7c77 gimplify_cleanup_point_expr
	../../src/gcc/gimplify.cc:8413
0x190b651 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*), int)
	../../src/gcc/gimplify.cc:20885
0x193a6a2 gimplify_stmt(tree_node**, gimple**)
	../../src/gcc/gimplify.cc:8686
0x193a6a2 gimplify_cond_expr
	../../src/gcc/gimplify.cc:5762
0x190b6ea gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*), int)
	../../src/gcc/gimplify.cc:20440
0x190b693 gimplify_stmt(tree_node**, gimple**)
	../../src/gcc/gimplify.cc:8686
0x190b693 gimplify_statement_list
	../../src/gcc/gimplify.cc:2294
0x190b693 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*), int)
	../../src/gcc/gimplify.cc:20937
0x190c96a gimplify_stmt(tree_node**, gimple**)
	../../src/gcc/gimplify.cc:8686
0x190c96a gimplify_statement_list
	../../src/gcc/gimplify.cc:2294
0x190c96a gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*), int)
	../../src/gcc/gimplify.cc:20937
0x1ae7c77 gimplify_stmt(tree_node**, gimple**)
	../../src/gcc/gimplify.cc:8686
0x1ae7c77 gimplify_cleanup_point_expr
	../../src/gcc/gimplify.cc:8413
0x190b651 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*), int)
	../../src/gcc/gimplify.cc:20885
0x190c929 gimplify_stmt(tree_node**, gimple**)
	../../src/gcc/gimplify.cc:8686
0x190c929 gimplify_statement_list
	../../src/gcc/gimplify.cc:2294
/usr/libexec/gcc/x86_64-linux-gnu/16/cc1plus -quiet -imultiarch x86_64-linux-gnu -D_GNU_SOURCE bug.cpp -quiet -dumpbase bug.cpp -dumpbase-ext .cpp -mtune=generic -march=x86-64 -std=c++20 -fasynchronous-unwind-tables -o /home/vak/.tmp/ccUT3TC5.s
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-16/README.Bugs> for instructions.