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c7485d73ac
Currently, `zig ast-check` fails on ZON files, because it tries to interpret the file as Zig source code. This commit introduces a new verification pass, `std.zig.ZonGen`, which applies to an AST in ZON mode. Like `AstGen`, this pass also converts the AST into a more helpful format. Rather than a sequence of instructions like `Zir`, the output format of `ZonGen` is a new datastructure called `Zoir`. This type is essentially a simpler form of AST, containing only the information required for consumers of ZON. It is also far more compact than `std.zig.Ast`, with the size generally being comparable to the size of the well-formatted source file. The emitted `Zoir` is currently not used aside from the `-t` option to `ast-check` which causes it to be dumped to stdout. However, in future, it can be used for comptime `@import` of ZON files, as well as for simpler handling of files like `build.zig.zon`, and even by other parts of the Zig Standard Library. Resolves: #22078