Zig program running on wasmtime (WASI runtime)

hello_wasi.zig

//! Example of using the zig standard library and reading command line arguments.
//! https://ziglang.org/documentation/master/#WASI
//! See also the talk Zig loves WASI! by Jakub Konka
//! https://www.youtube.com/watch?v=g_Degmqfo4Q

/// In order to run this example you will need a WebAssembly runtime such as wasmtime.
/// https://wasmtime.dev/
/// 1. compile the wasm module with the zig compiler
/// zig build-exe hello_wasi.zig -target wasm32-wasi
/// 2. run the .wasm module with wasmtime and pass the command line arguments
/// wasmtime hello_wasi.wasm 123 hello
const std = @import("std");

pub fn main() !void {
    var general_purpose_allocator = std.heap.GeneralPurposeAllocator(.{}){};
    const gpa = &general_purpose_allocator.allocator;
    const args = try std.process.argsAlloc(gpa);
    defer std.process.argsFree(gpa, args);

    for (args) |arg, i| {
        std.debug.print("{}: {}\n", .{ i, arg });
    }
}