make unsafeUninitializedCapacity initializers use typed throws

Author: JaapWijnen

stdlib/public/core/Array.swift

@@ -1512,12 +1512,12 @@ extension Array {
   /// Implementation for Array(unsafeUninitializedCapacity:initializingWith:)
   /// and ContiguousArray(unsafeUninitializedCapacity:initializingWith:)
   @inlinable
-  internal init(
+  internal init<E>(
     _unsafeUninitializedCapacity: Int,
     initializingWith initializer: (
       _ buffer: inout UnsafeMutableBufferPointer<Element>,
-      _ initializedCount: inout Int) throws -> Void
-  ) rethrows {
+      _ initializedCount: inout Int) throws(E) -> Void
+  ) throws(E) {
     var firstElementAddress: UnsafeMutablePointer<Element>
     unsafe (self, firstElementAddress) =
       unsafe Array._allocateUninitialized(_unsafeUninitializedCapacity)
@@ -1567,12 +1567,12 @@ extension Array {
   ///         which begins as zero. Set `initializedCount` to the number of
   ///         elements you initialize.
   @_alwaysEmitIntoClient @inlinable
-  public init(
+  public init<E>(
     unsafeUninitializedCapacity: Int,
     initializingWith initializer: (
       _ buffer: inout UnsafeMutableBufferPointer<Element>,
-      _ initializedCount: inout Int) throws -> Void
-  ) rethrows {
+      _ initializedCount: inout Int) throws(E) -> Void
+  ) throws(E) {
     self = try unsafe Array(
       _unsafeUninitializedCapacity: unsafeUninitializedCapacity,
       initializingWith: initializer)

stdlib/public/core/ContiguousArray.swift

@@ -1105,12 +1105,12 @@ extension ContiguousArray {
   ///         which begins as zero. Set `initializedCount` to the number of
   ///         elements you initialize.
   @_alwaysEmitIntoClient @inlinable
-  public init(
+  public init<E>(
     unsafeUninitializedCapacity: Int,
     initializingWith initializer: (
       _ buffer: inout UnsafeMutableBufferPointer<Element>,
-      _ initializedCount: inout Int) throws -> Void
-  ) rethrows {
+      _ initializedCount: inout Int) throws(E) -> Void
+  ) throws(E) {
     self = try unsafe ContiguousArray(Array(
       _unsafeUninitializedCapacity: unsafeUninitializedCapacity,
       initializingWith: initializer))