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The test assumes `:foo` is a static symbol, but that is only true
if a literal `:foo` was parsed before `"foo".to_sym` was evaled:
```ruby
require 'objspace'
foo_sym = "foo".to_sym
puts ObjectSpace.dump(eval(":foo"))
```
```
{"address":"0x100fb46d0", "type":"SYMBOL", "shape_id":10, "slot_size":40, "class":"0x100d3e9c8", "frozen":true, "bytesize":3, "value":"foo", "memsize":40, "flags":{"wb_protected":true, "marking":true, "marked":true}}
```