v/vlib/compiler/tests/repl/chained_fields.repl

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/* 1 */ struct A { mut: v int }
/* 2 */ struct B { a A }
/* 3 */ struct C { mut: b B }
/* 4 */ struct D { mut: c C }
/* 5 */ struct E { mut: v []int }
/* 6 */ struct F { e []E }
/* 7 */ mut s := 'hello world'
/*( 8)*/ s.len = 0 // Error (field len immutable)
/* 8 */ mut b := B{}
/*( 9)*/ b.a.v = 1 // Error (field a immutable)
/*( 9)*/ b.a = A{} // Error (field a immutable)
/* 9 */ b = B{A{2}} // Correct
/* 10 */ mut c := C{}
/* 11 */ c.b = B{} // Correct
/*(12)*/ c.b.a = A{} // Error (field a immutable)
/*(12)*/ c.b.a.v = 1 // Error (field a immutable)
/* 12 */ c2 := C{}
/*(13)*/ c2.b = B{} // Error (c2 immutable)
/* 13 */ mut d := D{}
/* 14 */ d.c.b = B{} // Correct
/* 15 */ mut f := F{}
/*(16)*/ f.e << E{} // Error (field e immutable)
/*(16)*/ f.e[0].v << 1 // Error (field e immutable)
/* 16 */ e := E{}
/*(17)*/ e.v << 1 // Error (e immutable)
===output===
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cannot modify immutable field `len` (type `string`)
declare the field with `mut:`
struct string {
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mut:
len int
}
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cannot modify immutable field `a` (type `B`)
declare the field with `mut:`
struct B {
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mut:
a A
}
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cannot modify immutable field `a` (type `B`)
declare the field with `mut:`
struct B {
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mut:
a A
}
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cannot modify immutable field `a` (type `B`)
declare the field with `mut:`
struct B {
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mut:
a A
}
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cannot modify immutable field `a` (type `B`)
declare the field with `mut:`
struct B {
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mut:
a A
}
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`c2` is immutable
cannot modify immutable field `e` (type `F`)
declare the field with `mut:`
struct F {
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mut:
e []E
}
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cannot modify immutable field `e` (type `F`)
declare the field with `mut:`
struct F {
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mut:
e []E
}
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`e` is immutable (can't <<)