v/vlib/compiler/tests/string_struct_interpolation...

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V

struct Foo {
bar int
mut:
str string
}
fn (f Foo) baz() string {
return 'baz'
}
fn test_string_method_interpolation() {
foo := Foo{}
s := 'baz=${foo.baz()}'
assert s == 'baz=baz'
}
fn test_adding_to_mutable_string_field() {
mut foo := Foo{10, 'hi'}
assert foo.bar == 10
assert foo.str == 'hi'
foo.str += '!'
eprintln( foo.str )
assert foo.str == 'hi!'
}