compiler crash while building obj file

[DutchGhost]

The following code causes the compiler to crash when zig build-obj <file.zig>:

const std = @import("std");
const mem = std.mem;
const heap = std.heap;
const heapAllocator = heap.DirectAllocator;
const Allocator = mem.Allocator;

const allocator = struct {
  internal_allocator: heapAllocator,

  pub fn init() allocator {
    return allocator {
      .internal_allocator = heapAllocator.init()
    };
  }

  pub fn allocate(self: *@This(), size: usize, alignment: usize) error{OutOfMemory}![]u8 {
    var slice = [0]u8 {};
    var alloc: *Allocator = &self.internal_allocator.allocator;
    return alloc.reallocFn(alloc, &slice, 0, size, @intCast(u29, alignment));
  }
};


export fn allocate(size: usize, alignment: usize) *u8 {
  var alloc = allocator.init();
  
  if(alloc.allocate(size, alignment)) |slice| {
    return &slice[0];
  } else |err| {
    return @intToPtr(*u8, 1);
  }
}

gdb backtrace:

Assertion failed. This is a bug in the Zig compiler.
???:?:?: 0x8704029 in ??? (???)


???:?:?: 0x86c8494 in ??? (???)



Program received signal SIGABRT, Aborted.
__restore_sigs (set=set@entry=0x7ffffffecd40) at ./arch/x86_64/syscall_arch.h:40
40      ./arch/x86_64/syscall_arch.h: No such file or directory.
(gdb) backtrace
#0  __restore_sigs (set=set@entry=0x7ffffffecd40) at ./arch/x86_64/syscall_arch.h:40
#1  0x000000000c735c4d in raise (sig=sig@entry=6) at src/signal/raise.c:11
#2  0x000000000c730aaa in abort () at src/exit/abort.c:13
#3  0x0000000008706299 in std.os.abort () at /deps/zig/std/os.zig:200
#4  0x0000000008703e96 in std.debug.panicExtra () at /deps/zig/std/debug.zig:192
#5  0x0000000008703e38 in std.special.panic (msg=...) at /deps/zig/std/special/panic.zig:27
#6  0x000000000870fabc in std.debug.writeCurrentStackTrace () at /deps/zig/std/debug.zig:268
#7  0x0000000008706915 in std.debug.dumpCurrentStackTrace (start_addr=...) at /deps/zig/std/debug.zig:89
#8  0x0000000008703f38 in std.debug.panicExtra () at /deps/zig/std/debug.zig:199
#9  0x0000000008703e38 in std.special.panic (msg=...) at /deps/zig/std/special/panic.zig:27
#10 0x000000000870402a in stage2_panic (ptr=0xc7651c8 "Assertion failed. This is a bug in the Zig compiler.")
    at stage1.zig:16
#11 0x00000000086c8495 in assert(bool) [clone .part.0] ()
#12 0x00000000086c84ac in assert(bool) ()
#13 0x0000000008644849 in ir_render_cast(CodeGen*, IrExecutable*, IrInstructionCast*) [clone .isra.178] ()
#14 0x000000000864ad7b in ir_render_instruction(CodeGen*, IrExecutable*, IrInstruction*) [clone .isra.206] ()
#15 0x000000000864cab5 in do_code_gen(CodeGen*) ()
#16 0x00000000086500d7 in codegen_build_and_link(CodeGen*) ()
#17 0x000000000857925a in main ()
(gdb)

[daurnimator]

Example as given now fails with:

$ ./zig build-obj ../2680.zig 
/home/daurnimator/src/zig/2680.zig:4:27: error: 'DirectAllocator' is private
const heapAllocator = heap.DirectAllocator;
                          ^
/home/daurnimator/src/zig/build/lib/zig/std/heap.zig:42:1: note: declared here
const DirectAllocator = struct {
^
/home/daurnimator/src/zig/2680.zig:8:23: note: referenced here
  internal_allocator: heapAllocator,
                      ^
/home/daurnimator/src/zig/2680.zig:25:24: note: referenced here
  var alloc = allocator.init();
                       ^

Which looks like the expected behaviour.

This was likely a dupe of #2692