compiler panics when branching break on comptime

[leesongun]

Zig Version

0.10.0-dev.1741+d2681d253

Steps to Reproduce

export const a = init: {
    if (true)
        break :init true;
    break :init true;
};

godbolt

checked locally with zig 0.10.0-dev.1741+d2681d253, reproduced with godbolt.

Expected Behavior

the program compiles

Actual Behavior

when analyzing <source>:1:23 in compiler source at /workspace/src/stage1/ir.cpp:5626: thread 1 panic: assertion failed. This is a bug in the Zig compiler.

which is

static void ir_start_bb(IrAnalyze *ira, Stage1ZirBasicBlock *old_bb, Stage1ZirBasicBlock *const_predecessor_bb) {
    src_assert(!old_bb->suspended,
            (old_bb->instruction_list.length != 0) ?
            old_bb->instruction_list.at(0)->source_node : nullptr);

[jibal]

Why closed? I've encountered this panic. (Unfortunately I didn't note the code that caused it, but worked around it ... I hit several compiler bugs / day and have become sloppy about recording them.)

[leesongun]

duplicate of #7386?