Test struct of zen language

01test-struct.zen

const std = @import("std");

const st1 = struct {
    var gvar1: u32 = 1;  // Global
    fvar1: u32 = 1, // Field
};

fn f1() void {

    const st2 = struct {
        var gvar2: u32 = 2;  // Global in f1()
        fvar2: u32, // Field
    };

    //var hoge: st1 = st1{.gvar1 = 1, .fvar1 = 1}; // error[E07004]: 'st1' has no member 'gvar1'
    var hoge: st1 = st1{.fvar1 = 1};
    //hoge.gvar1 += 1; // error[E07004]: 'st1' has no member 'gvar1'
    hoge.fvar1 += 1; // OK
    st1.gvar1 += 1;  // OK

    //var fuga: st2 = st2{.gvar2 = 1, .fvar2 = 1}; // error[E07004]: 'st2' has no member 'gvar2'
    var fuga: st2 = st2{.fvar2 = 1};
    //fuga.gvar2 += 1;  // error[E07004]: 'st2' has no member 'gvar2'
    fuga.fvar2 += 1;  // OK
    st2.gvar2 += 1;   // OK

    std.debug.warn("f1: {}, {}, {}, {}\n", .{st1.gvar1, hoge.fvar1, st2.gvar2, fuga.fvar2});
}

fn f2() void {

    //var hoge: st1 = st1{.gvar1 = 1, .fvar1 = 1}; //error[E07004]: 'st1' has no member 'gvar1'
    var hoge: st1 = st1{.fvar1 = 1}; 
    //hoge.gvar1 += 1; // error[E07004]: 'st1' has no member 'gvar1'
    hoge.fvar1 += 1; // OK
    st1.gvar1 += 1;  // OK

    //var fuga: st2 = st2{.gvar2 = 1, .fvar2 = 1}; // error[E07004]: 'st2' has no member 'gvar2'
    //var fuga: st2 = st2{.fvar2 = 1}; // error[E07002]: use of undeclared identifier 'st2'

    std.debug.warn("f2: {}, {}\n", .{st1.gvar1, hoge.fvar1});
}

pub fn main() anyerror!void {
    var i:u32 = 0;
    std.debug.warn("f1: {}, {}, {}, {}\n", .{"st1.gvar1", "hoge.fvar1", "st2.gvar2", "fuga.fvar2"});
    while (i < 10): (i += 1) {
        f1();
    }
    std.debug.warn("f2: {}, {}\n", .{"st1.gvar1", "hoge.fvar1"});
    i = 0;
    while (i < 10): (i += 1) {
        f2();
    }
}

02output.txt

f1: st1.gvar1, hoge.fvar1, st2.gvar2, fuga.fvar2
f1: 2, 2, 3, 2
f1: 3, 2, 4, 2
f1: 4, 2, 5, 2
f1: 5, 2, 6, 2
f1: 6, 2, 7, 2
f1: 7, 2, 8, 2
f1: 8, 2, 9, 2
f1: 9, 2, 10, 2
f1: 10, 2, 11, 2
f1: 11, 2, 12, 2
f2: st1.gvar1, hoge.fvar1
f2: 12, 2
f2: 13, 2
f2: 14, 2
f2: 15, 2
f2: 16, 2
f2: 17, 2
f2: 18, 2
f2: 19, 2
f2: 20, 2
f2: 21, 2