zig/test/incremental/add_decl

#exe {
-Mroot=main.zig
#}

#write 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.io();
#}
#update
#check stdout {
good morning
#}

#write 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.io();
#}
#update {
add new declaration#}
#check stdout {
good morning
#}

#write 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.io();
#}
#update {
reference new declaration#}
#check stdout {
good evening
#}

#write 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.io();
#}
#update {
reference missing declaration#}
#check errors {
main.zig:3:52: error: use of undeclared identifier 'qux'
#}

#write 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.io();
#}
#update {
add missing declaration#}
#check stdout {
good night
#}

#write 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.io();
#}
#update {
remove unused declarations#}
#check stdout {
good night
#}