{
  "crate": "rustc_arena",
  "module": "root",
  "usages": [
    {
      "symbol": "call_once",
      "kind": "method_call",
      "usage_count": 1,
      "usage_type": "MethodCall",
      "node_type": "Item",
      "user_def_id": "DefId(0:19 ~ rustc_arena[04f9]::outline)",
      "used_def_id": "DefId(2:3989 ~ core[4720]::ops::function::FnOnce::call_once)",
      "user_crate": "rustc_arena",
      "used_crate": "core"
    },
    {
      "symbol": "is_power_of_two",
      "kind": "method_call",
      "usage_count": 1,
      "usage_type": "MethodCall",
      "node_type": "Item",
      "user_def_id": "DefId(0:64 ~ rustc_arena[04f9]::align_down)",
      "used_def_id": "DefId(2:35803 ~ core[4720]::num::{impl#11}::is_power_of_two)",
      "user_crate": "rustc_arena",
      "used_crate": "core"
    },
    {
      "symbol": "is_power_of_two",
      "kind": "method_call",
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      "usage_type": "MethodCall",
      "node_type": "Item",
      "user_def_id": "DefId(0:65 ~ rustc_arena[04f9]::align_up)",
      "used_def_id": "DefId(2:35803 ~ core[4720]::num::{impl#11}::is_power_of_two)",
      "user_crate": "rustc_arena",
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    }
  ]
}