cImport

fn cImport(
    gz: *GenZir,
    scope: *Scope,
    node: Ast.Node.Index,
    body_node: Ast.Node.Index,
) InnerError!Zir.Inst.Ref {
    const astgen = gz.astgen;
    const gpa = astgen.gpa;

    if (gz.c_import) return gz.astgen.failNode(node, "cannot nest @cImport", .{});

    var block_scope = gz.makeSubBlock(scope);
    block_scope.is_comptime = true;
    block_scope.c_import = true;
    defer block_scope.unstack();

    const block_inst = try gz.makeBlockInst(.c_import, node);
    const block_result = try fullBodyExpr(&block_scope, &block_scope.base, .{ .rl = .none }, body_node, .normal);
    _ = try gz.addUnNode(.ensure_result_used, block_result, node);
    if (!gz.refIsNoReturn(block_result)) {
        _ = try block_scope.addBreak(.break_inline, block_inst, .void_value);
    }
    try block_scope.setBlockBody(block_inst);
    // block_scope unstacked now, can add new instructions to gz
    try gz.instructions.append(gpa, block_inst);

    return block_inst.toRef();
}