% cat test.zig
pub fn main() void {
    var a: u32 = 1;
    defer {
        thing1();
        print("a");
    }
}
% git log | head
commit a7221ef4e902e63e72524559a067afcf6c1dfd17
Author: Andrew Kelley <andrew@ziglang.org>
Date:   Thu May 6 22:30:44 2021 -0700

    Sema: implement `@typeInfo` for functions

    The goal is to get start code to be able to inspect the calling
    convention of `main` in order to determine whether to export a main for
    libc to call, or to allow the root source file to do it.

% pwd
/home/jacob/dev/zig/build
% ninja
ninja: no work to do.
% ./zig build-exe test.zig -fno-LLVM
thread 5505 panic: index out of bounds
/home/jacob/dev/zig/src/Module.zig:3119:63: 0xe57dbf in Module.scanDecl (zig1)
    const decl_block_inst_data = zir.instructions.items(.data)[decl_index].pl_node;
                                                              ^
/home/jacob/dev/zig/src/Module.zig:3086:21: 0xd1fa81 in Module.scanNamespace (zig1)
        try scanDecl(&scan_decl_iter, decl_sub_index, flags);
                    ^
/home/jacob/dev/zig/src/Sema.zig:680:35: 0xc055d6 in Sema.analyzeStructDecl (zig1)
    _ = try sema.mod.scanNamespace(&struct_obj.namespace, extra.end, decls_len, new_decl);
                                  ^
/home/jacob/dev/zig/src/Module.zig:2736:31: 0xc04809 in Module.semaFile (zig1)
    try sema.analyzeStructDecl(new_decl, main_struct_inst, struct_obj);
                              ^
/home/jacob/dev/zig/src/Module.zig:2653:24: 0xa117b0 in Module.semaPkg (zig1)
    return mod.semaFile(file);
                       ^
/home/jacob/dev/zig/src/Compilation.zig:2027:27: 0xa0667e in Compilation.performAllTheWork (zig1)
            module.semaPkg(pkg) catch |err| switch (err) {
                          ^
/home/jacob/dev/zig/src/Compilation.zig:1612:31: 0x9ffee8 in Compilation.update (zig1)
    try self.performAllTheWork();
                              ^
/home/jacob/dev/zig/src/main.zig:2223:20: 0x99a7df in main.updateModule (zig1)
    try comp.update();
                   ^
/home/jacob/dev/zig/src/main.zig:1960:17: 0x8cc058 in main.buildOutputType (zig1)
    updateModule(gpa, comp, hook) catch |err| switch (err) {
                ^
/home/jacob/dev/zig/src/main.zig:186:31: 0x8a1767 in main.mainArgs (zig1)
        return buildOutputType(gpa, arena, args, .{ .build = .Exe });
                              ^
/home/jacob/dev/zig/src/stage1.zig:45:24: 0x8a11a9 in main (zig1)
        stage2.mainArgs(gpa, arena, args) catch unreachable;
                       ^
Aborted (core dumped)
%