Fix warning

Cargo.lock

 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
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+[[package]]
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+checksum = "cd9fd44efafa8690358b7408d253adf110036b88f55672a933f01d616ad9b1b9"
+dependencies = [
+ "nodrop",
+]
+
 [[package]]
 name = "arrayvec"
 version = "0.5.1"
  "anyhow",
  "async-std",
  "async-trait",
- "base64",
+ "base64 0.12.3",
  "bincode",
  "blake3",
  "chrono",
  "hmac",
  "kv-log-macro",
- "rand",
+ "rand 0.7.3",
  "serde",
  "serde_json",
  "sha2",
 dependencies = [
  "async-attributes",
  "async-task",
- "crossbeam-utils",
+ "crossbeam-utils 0.7.2",
  "futures-channel",
  "futures-core",
  "futures-io",
 source = "registry+https://github.com/rust-lang/crates.io-index"
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+[[package]]
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+checksum = "0b25d992356d2eb0ed82172f5248873db5560c4721f564b13cb5193bda5e668e"
+dependencies = [
+ "byteorder",
+]
+
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+dependencies = [
+ "arrayvec 0.4.12",
+ "constant_time_eq",
+]
+
 [[package]]
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 dependencies = [
  "arrayref",
- "arrayvec",
+ "arrayvec 0.5.1",
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  "cfg-if",
  "constant_time_eq",
  "parse-zoneinfo",
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+[[package]]
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+dependencies = [
+ "bitflags",
+]
+
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 dependencies = [
  "aes-gcm",
- "base64",
+ "base64 0.12.3",
  "hkdf",
  "hmac",
  "percent-encoding",
- "rand",
+ "rand 0.7.3",
  "sha2",
  "time 0.2.16",
  "version_check",
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 checksum = "8aebca1129a03dc6dc2b127edd729435bbc4a37e1d5f4d7513165089ceb02634"
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d1c92ff2d7a202d592f5a412d75cf421495c913817781c1cb383bf12a77e185f"
+dependencies = [
+ "cfg-if",
+ "crossbeam-channel",
+ "crossbeam-deque",
+ "crossbeam-epoch 0.6.1",
+ "crossbeam-utils 0.6.6",
+ "lazy_static",
+ "num_cpus",
+ "parking_lot",
+]
+
+[[package]]
+name = "crossbeam-channel"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8ec7fcd21571dc78f96cc96243cab8d8f035247c3efd16c687be154c3fa9efa"
+dependencies = [
+ "crossbeam-utils 0.6.6",
+]
+
+[[package]]
+name = "crossbeam-deque"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05e44b8cf3e1a625844d1750e1f7820da46044ff6d28f4d43e455ba3e5bb2c13"
+dependencies = [
+ "crossbeam-epoch 0.7.2",
+ "crossbeam-utils 0.6.6",
+]
+
+[[package]]
+name = "crossbeam-epoch"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2449aaa4ec7ef96e5fb24db16024b935df718e9ae1cec0a1e68feeca2efca7b8"
+dependencies = [
+ "arrayvec 0.4.12",
+ "cfg-if",
+ "crossbeam-utils 0.6.6",
+ "lazy_static",
+ "memoffset 0.2.1",
+ "scopeguard 0.3.3",
+]
+
+[[package]]
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+dependencies = [
+ "arrayvec 0.4.12",
+ "cfg-if",
+ "crossbeam-utils 0.6.6",
+ "lazy_static",
+ "memoffset 0.5.6",
+ "scopeguard 1.1.0",
+]
+
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 dependencies = [
  "cfg-if",
- "crossbeam-utils",
+ "crossbeam-utils 0.7.2",
  "maybe-uninit",
 ]
 
+[[package]]
+name = "crossbeam-utils"
+version = "0.6.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04973fa96e96579258a5091af6003abde64af786b860f18622b82e026cca60e6"
+dependencies = [
+ "cfg-if",
+ "lazy_static",
+]
+
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+[[package]]
+name = "fuchsia-cprng"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
+
 [[package]]
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  "pin-project-lite",
- "rand",
+ "rand 0.7.3",
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 checksum = "22dcbf2a4a289528dbef21686354904e1c694ac642610a9bff9e7df730d9ec72"
 dependencies = [
- "crossbeam-utils",
+ "crossbeam-utils 0.7.2",
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  "lazy_static",
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 checksum = "a2f02823cf78b754822df5f7f268fb59822e7296276d3e069d8e8cb26a14bd10"
 
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+checksum = "62ebf1391f6acad60e5c8b43706dde4582df75c06698ab44511d15016bc2442c"
+dependencies = [
+ "owning_ref",
+ "scopeguard 0.3.3",
+]
+
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 checksum = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400"
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f9dc261e2b62d7a622bf416ea3c5245cdd5d9a7fcc428c0d06804dfce1775b3"
+
+[[package]]
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+dependencies = [
+ "autocfg",
+]
+
 [[package]]
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+[[package]]
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+checksum = "72ef4a56884ca558e5ddb05a1d1e7e1bfd9a68d9ed024c21704cc98872dae1bb"
+
 [[package]]
 name = "num-integer"
 version = "0.1.43"
  "dotenv",
  "lazy_static",
  "pulldown-cmark",
+ "rust-argon2",
  "rust-embed",
  "serde",
  "serde_json",
  "tide-tera",
 ]
 
+[[package]]
+name = "owning_ref"
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+checksum = "6ff55baddef9e4ad00f88b6c743a2a8062d4c6ade126c2a528644b8e444d52ce"
+dependencies = [
+ "stable_deref_trait",
+]
+
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+ "lock_api",
+ "parking_lot_core",
+]
+
+[[package]]
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+dependencies = [
+ "libc",
+ "rand 0.5.6",
+ "rustc_version",
+ "smallvec",
+ "winapi",
+]
+
 [[package]]
 name = "parse-zoneinfo"
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 ]
 
+[[package]]
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+checksum = "c618c47cd3ebd209790115ab837de41425723956ad3ce2e6a7f09890947cacb9"
+dependencies = [
+ "cloudabi",
+ "fuchsia-cprng",
+ "libc",
+ "rand_core 0.3.1",
+ "winapi",
+]
+
 [[package]]
 name = "rand"
 version = "0.7.3"
  "getrandom",
  "libc",
  "rand_chacha",
- "rand_core",
+ "rand_core 0.5.1",
  "rand_hc",
 ]
 
 checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.5.1",
 ]
 
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+dependencies = [
+ "rand_core 0.4.2",
+]
+
+[[package]]
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+version = "0.4.2"
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+checksum = "9c33a3c44ca05fa6f1807d8e6743f3824e8509beca625669633be0acbdf509dc"
+
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 checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
 dependencies = [
- "rand_core",
+ "rand_core 0.5.1",
 ]
 
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 checksum = "56770675ebc04927ded3e60633437841581c285dc6236109ea25fbf3beb7b59e"
 
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+dependencies = [
+ "base64 0.10.1",
+ "blake2-rfc",
+ "crossbeam",
+]
+
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+
+[[package]]
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+checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
+
 [[package]]
 name = "semver"
 version = "0.9.0"
  "deunicode",
 ]
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b97fcaeba89edba30f044a10c6a3cc39df9c3f17d7cd829dd1446cab35f890e0"
+dependencies = [
+ "maybe-uninit",
+]
+
 [[package]]
 name = "smol"
 version = "0.1.18"
  "percent-encoding",
  "pest",
  "pest_derive",
- "rand",
+ "rand 0.7.3",
  "regex",
  "serde",
  "serde_json",

oslo-lib/src/routes.rs

         match req.session_mut().get::<String>(key) {
             Some(value) => {
                 req.session_mut().remove(key);
-                &context.insert(key, &value);
+                let _ = &context.insert(key, &value);
             }
             None => {}
         }