diff --git a/Sources/NIO/ByteBuffer-core.swift b/Sources/NIO/ByteBuffer-core.swift
index eed32ede54..27d55c820f 100644
--- a/Sources/NIO/ByteBuffer-core.swift
+++ b/Sources/NIO/ByteBuffer-core.swift
@@ -32,8 +32,8 @@ struct _ByteBufferSlice {
         return Int(self.upperBound - self.lowerBound)
     }
     init() {
-        self._begin = 0
-        self.upperBound = 0
+        self._begin = .init(integerLiteral: 0)
+        self.upperBound = .init(integerLiteral: 0)
     }
     static var maxSupportedLowerBound: ByteBuffer._Index {
         return ByteBuffer._Index(_UInt24.max)
diff --git a/Sources/NIO/EventLoopFuture.swift b/Sources/NIO/EventLoopFuture.swift
index 129d1aba30..66e249127a 100644
--- a/Sources/NIO/EventLoopFuture.swift
+++ b/Sources/NIO/EventLoopFuture.swift
@@ -22,7 +22,7 @@ import NIOConcurrencyHelpers
 /// In particular, note that _run() here continues to obtain and execute lists of callbacks until it completes.
 /// This eliminates recursion when processing `flatMap()` chains.
 @usableFromInline
-internal struct CallbackList: ExpressibleByArrayLiteral {
+internal struct CallbackList {
     @usableFromInline
     internal typealias Element = () -> CallbackList
     @usableFromInline
@@ -36,17 +36,6 @@ internal struct CallbackList: ExpressibleByArrayLiteral {
         self.furtherCallbacks = nil
     }
 
-    @inlinable
-    internal init(arrayLiteral: Element...) {
-        self.init()
-        if !arrayLiteral.isEmpty {
-            self.firstCallback = arrayLiteral[0]
-            if arrayLiteral.count > 1 {
-                self.furtherCallbacks = Array(arrayLiteral.dropFirst())
-            }
-        }
-    }
-
     @inlinable
     internal mutating func append(_ callback: @escaping () -> CallbackList) {
         if self.firstCallback == nil {
diff --git a/Sources/NIO/IntegerTypes.swift b/Sources/NIO/IntegerTypes.swift
index 43b56c1cc9..ed29a328b8 100644
--- a/Sources/NIO/IntegerTypes.swift
+++ b/Sources/NIO/IntegerTypes.swift
@@ -16,7 +16,7 @@
 
 /// A 24-bit unsigned integer value type.
 @usableFromInline
-struct _UInt24: ExpressibleByIntegerLiteral {
+struct _UInt24 {
     @usableFromInline
     typealias IntegerLiteralType = UInt16
 
@@ -41,7 +41,7 @@ struct _UInt24: ExpressibleByIntegerLiteral {
         return .init(_b12: .max, b3: .max)
     }
 
-    static let min: _UInt24 = 0
+    static let min: _UInt24 = .init(integerLiteral: 0)
 }
 
 extension UInt32 {
@@ -85,37 +85,37 @@ extension _UInt24: CustomStringConvertible {
 // MARK: _UInt56
 
 /// A 56-bit unsigned integer value type.
-struct _UInt56: ExpressibleByIntegerLiteral {
+struct _UInt56 {
     typealias IntegerLiteralType = UInt32
 
     @usableFromInline var b1234: UInt32
     @usableFromInline var b56: UInt16
     @usableFromInline var b7: UInt8
 
-    private init(b1234: UInt32, b56: UInt16, b7: UInt8) {
-        self.b1234 = b1234
+    @inlinable init(_b1234: UInt32, b56: UInt16, b7: UInt8) {
+        self.b1234 = _b1234
         self.b56 = b56
         self.b7 = b7
     }
 
-    init(integerLiteral value: UInt32) {
-        self.init(b1234: value, b56: 0, b7: 0)
+    @inlinable init(integerLiteral value: UInt32) {
+        self.init(_b1234: value, b56: 0, b7: 0)
     }
 
     static let bitWidth: Int = 56
 
     static var max: _UInt56 {
-        return .init(b1234: .max, b56: .max, b7: .max)
+        return .init(_b1234: .max, b56: .max, b7: .max)
     }
 
-    static let min: _UInt56 = 0
+    static let min: _UInt56 = .init(integerLiteral: 0)
 }
 
 extension _UInt56 {
     init(_ value: UInt64) {
         assert(value & 0xff_00_00_00_00_00_00_00 == 0, "value \(value) too large for _UInt56")
-        self.init(b1234: UInt32(truncatingIfNeeded: (value &          0xff_ff_ff_ff) >> 0 ),
-                  b56:   UInt16(truncatingIfNeeded: (value &    0xff_ff_00_00_00_00) >> 32),
+        self.init(_b1234: UInt32(truncatingIfNeeded: (value &          0xff_ff_ff_ff) >> 0 ),
+                  b56:    UInt16(truncatingIfNeeded: (value &    0xff_ff_00_00_00_00) >> 32),
                   b7:     UInt8(                     value                           >> 48))
     }