zig/test/incremental/add_decl

#target=x86_64-linux-selfhosted
#target=x86_64-windows-selfhosted
#target=x86_64-linux-cbe
#target=x86_64-windows-cbe
//#target=wasm32-wasi-selfhosted
#update=initial version
#file=main.zig
const std = @import("std");
pub fn main() !void {
    try std.Io.File.stdout().writeStreamingAll(io, foo);
}
const foo = "good morning\n";
const io = std.Io.Threaded.global_single_threaded.ioBasic();
#expect_stdout="good morning\n"

#update=add new declaration
#file=main.zig
const std = @import("std");
pub fn main() !void {
    try std.Io.File.stdout().writeStreamingAll(io, foo);
}
const foo = "good morning\n";
const bar = "good evening\n";
const io = std.Io.Threaded.global_single_threaded.ioBasic();
#expect_stdout="good morning\n"

#update=reference new declaration
#file=main.zig
const std = @import("std");
pub fn main() !void {
    try std.Io.File.stdout().writeStreamingAll(io, bar);
}
const foo = "good morning\n";
const bar = "good evening\n";
const io = std.Io.Threaded.global_single_threaded.ioBasic();
#expect_stdout="good evening\n"

#update=reference missing declaration
#file=main.zig
const std = @import("std");
pub fn main() !void {
    try std.Io.File.stdout().writeStreamingAll(io, qux);
}
const foo = "good morning\n";
const bar = "good evening\n";
const io = std.Io.Threaded.global_single_threaded.ioBasic();
#expect_error=main.zig:3:52: error: use of undeclared identifier 'qux'

#update=add missing declaration
#file=main.zig
const std = @import("std");
pub fn main() !void {
    try std.Io.File.stdout().writeStreamingAll(io, qux);
}
const foo = "good morning\n";
const bar = "good evening\n";
const qux = "good night\n";
const io = std.Io.Threaded.global_single_threaded.ioBasic();
#expect_stdout="good night\n"

#update=remove unused declarations
#file=main.zig
const std = @import("std");
pub fn main() !void {
    try std.Io.File.stdout().writeStreamingAll(io, qux);
}
const qux = "good night\n";
const io = std.Io.Threaded.global_single_threaded.ioBasic();
#expect_stdout="good night\n"