From the documentation:

It is also possible to have local variables with static lifetime by using containers inside functions.

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<code>const std = @import("std");

const expect = std.testing.expect;

test "static local variable" {

try expect(foo() == 1235);

try expect(foo() == 1236);

}

fn foo() i32 {

const S = struct {

var x: i32 = 1234;

};

S.x += 1;

return S.x;

}

</code>

<code>const std = @import("std"); const expect = std.testing.expect; test "static local variable" { try expect(foo() == 1235); try expect(foo() == 1236); } fn foo() i32 { const S = struct { var x: i32 = 1234; }; S.x += 1; return S.x; } </code>

const std = @import("std");
const expect = std.testing.expect;

test "static local variable" {
    try expect(foo() == 1235);
    try expect(foo() == 1236);
}

fn foo() i32 {
    const S = struct {
        var x: i32 = 1234;
    };
    S.x += 1;
    return S.x;
}

Doesn’t this essentially make S inside foo a static variable with static memory storage as if it were declared in the file scope, but whose scope is simply limited to foo?