zig/test/incremental/make_decl_pub

#exe {
-Mroot=main.zig
#}

#write main.zig {
const foo = @import("foo.zig");
pub fn main() !void {
    try foo.hello();
}
#}
#write foo.zig {
const std = @import("std");
fn hello() !void {
    try std.Io.File.stdout().writeStreamingAll(io, "Hello, World!\n");
}
const io = std.Io.Threaded.global_single_threaded.io();
#}
#update
#check errors {
main.zig:3:12: error: 'hello' is not marked 'pub'
foo.zig:2:1: note: declared here
#}

#write foo.zig {
const std = @import("std");
pub fn hello() !void {
    try std.Io.File.stdout().writeStreamingAll(io, "Hello, World!\n");
}
const io = std.Io.Threaded.global_single_threaded.io();
#}
#update {
make hello pub#}
#check stdout {
Hello, World!
#}