Support nonisolated/isolated

https://github.com/apple/swift-evolution/blob/main/proposals/0313-actor-isolation-control.md

Author: taku0

swift-mode-font-lock.el

@@ -541,7 +541,7 @@ Return nil otherwise."
   '("associatedtype" "class" "deinit" "enum" "extension" "fileprivate" "func"
     "import" "init" "inout" "internal" "let" "open" "operator" "private"
     "protocol" "public" "some" "static" "struct" "subscript" "typealias" "var"
-    "actor")
+    "actor" "nonisolated" "isolated")
   "Keywords used in declarations.")
 
 (defconst swift-mode:statement-keywords

swift-mode-lexer.el

@@ -431,9 +431,10 @@ Return nil otherwise."
        ;; Suppress implicit semicolon around keywords that cannot start or end
        ;; statements.
        (member (swift-mode:token:text previous-token)
-               '("some" "inout" "in" "where"))
+               '("some" "inout" "in" "where" "isolated"))
        (member (swift-mode:token:text next-token)
-               '("some" "inout" "throws" "rethrows" "async" "in" "where")))
+               '("some" "inout" "throws" "rethrows" "in" "where"
+                 "isolated")))
       nil)
 
      ;; Inserts semicolon before open curly bracket.
@@ -458,7 +459,7 @@ Return nil otherwise."
               '("indirect" "convenience" "dynamic" "final" "infix" "lazy"
                 "mutating" "nonmutating" "optional" "override" "postfix"
                 "prefix" "required" "static" "unowned" "weak" "internal"
-                "private" "public" "open" "fileprivate"))
+                "private" "public" "open" "fileprivate" "nonisolated"))
       nil)
 
      ;; internal(set) private(set) public(set) open(set) fileprivate(set)
@@ -491,7 +492,7 @@ Return nil otherwise."
               '("indirect" "convenience" "dynamic" "final" "infix" "lazy"
                 "mutating" "nonmutating" "optional" "override" "postfix"
                 "prefix" "required" "static" "unowned" "weak" "internal"
-                "private" "public" "open" "fileprivate"))
+                "private" "public" "open" "fileprivate" "nonisolated"))
       t)
 
      ;; Inserts implicit semicolon around keywords that forms single keyword

test/swift-files/indent/declarations.swift

@@ -338,6 +338,9 @@ private
       B>
   (
     x:
+      @A
+      isolated
+      inout
       Int,
     y:
       Int
@@ -620,7 +623,8 @@ fileprivate
     B =
       D<E> {
     func foo()
-    func foo()
+    nonisolated
+      func foo()
 }
 
 

test/swift-files/indent/identifiers.swift

@@ -109,6 +109,12 @@ func foo() {
     foo(
       some: 1
     )
+    foo(
+      nonisolated: 1
+    )
+    foo(
+      isolated: 1
+    )
 
     // Keywords used in statements
     foo(