[Parse] Improve fix-it for @autoclosure(escaping)

  func f(x: @autoclosure(escaping) () -> Int) {}

used to be fixed as:

  func f(x: @@autoclosure @escaping  () -> Int) {}

Duplicated '@'
Unnecessary space after @escaping

Author: rintaro

lib/Parse/ParseDecl.cpp

@@ -1444,7 +1444,7 @@ bool Parser::parseTypeAttribute(TypeAttributes &Attributes, bool justChecking) {
   SourceLoc Loc = consumeToken();
 
   bool isAutoclosureEscaping = false;
-  SourceLoc autoclosureEscapingRightParenLoc;
+  SourceRange autoclosureEscapingParenRange;
   StringRef conventionName;
 
   // Handle @autoclosure(escaping)
@@ -1462,9 +1462,9 @@ bool Parser::parseTypeAttribute(TypeAttributes &Attributes, bool justChecking) {
     }
 
     if (isAutoclosureEscaping) {
-      consumeToken(tok::l_paren);
+      autoclosureEscapingParenRange.Start = consumeToken(tok::l_paren);
       consumeToken(tok::identifier);
-      autoclosureEscapingRightParenLoc = consumeToken(tok::r_paren);
+      autoclosureEscapingParenRange.End = consumeToken(tok::r_paren);
     }
   } else if (attr == TAK_convention) {
     SourceLoc LPLoc;
@@ -1516,9 +1516,11 @@ bool Parser::parseTypeAttribute(TypeAttributes &Attributes, bool justChecking) {
       if (Attributes.has(TAK_noescape)) {
         diagnose(Loc, diag::attr_noescape_conflicts_escaping_autoclosure);
       } else {
+        StringRef replacement = " @escaping ";
+        if (autoclosureEscapingParenRange.End.getAdvancedLoc(1) != Tok.getLoc())
+          replacement = replacement.drop_back();
         diagnose(Loc, diag::attr_autoclosure_escaping_deprecated)
-            .fixItReplace({Loc, autoclosureEscapingRightParenLoc},
-                          "@autoclosure @escaping ");
+            .fixItReplace(autoclosureEscapingParenRange, replacement);
       }
       Attributes.setAttr(TAK_escaping, Loc);
     } else if (Attributes.has(TAK_noescape)) {

test/attr/attr_autoclosure.swift

@@ -75,22 +75,22 @@ func func10(@autoclosure(escaping _: () -> ()) { } // expected-error{{expected '
 // expected-note@-1{{to match this opening '('}}
 
 func func11(_: @autoclosure(escaping) @noescape () -> ()) { } // expected-error{{@escaping conflicts with @noescape}}
-  // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{17-38=@autoclosure @escaping }}
+  // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{28-38= @escaping}}
 
 class Super {
   func f1(_ x: @autoclosure(escaping) () -> ()) { }
-    // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{17-38=@autoclosure @escaping }}
+    // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{28-38= @escaping}}
   func f2(_ x: @autoclosure(escaping) () -> ()) { } // expected-note {{potential overridden instance method 'f2' here}}
-    // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{17-38=@autoclosure @escaping }}
+    // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{28-38= @escaping}}
   func f3(x: @autoclosure () -> ()) { }
 }
 
 class Sub : Super {
   override func f1(_ x: @autoclosure(escaping)() -> ()) { }
-    // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{26-47=@autoclosure @escaping }}
+    // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{37-47= @escaping }}
   override func f2(_ x: @autoclosure () -> ()) { } // expected-error{{does not override any method}} // expected-note{{type does not match superclass instance method with type '(@autoclosure @escaping () -> ()) -> ()'}}
   override func f3(_ x: @autoclosure(escaping) () -> ()) { }  // expected-error{{does not override any method}}
-    // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{26-47=@autoclosure @escaping }}
+    // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{37-47= @escaping}}
 }
 
 func func12_sink(_ x: @escaping () -> Int) { }
@@ -101,7 +101,7 @@ func func12a(_ x: @autoclosure () -> Int) {
   func12_sink(x) // expected-error {{passing non-escaping parameter 'x' to function expecting an @escaping closure}}
 }
 func func12b(_ x: @autoclosure(escaping) () -> Int) {
-  // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{20-41=@autoclosure @escaping }}
+  // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{31-41= @escaping}}
   func12_sink(x) // ok
 }
 func func12c(_ x: @autoclosure @escaping () -> Int) {
@@ -132,7 +132,7 @@ enum AutoclosureFailableOf<T> {
 
 let _ : (@autoclosure () -> ()) -> ()
 let _ : (@autoclosure(escaping) () -> ()) -> ()
-  // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{11-32=@autoclosure @escaping }}
+  // expected-warning@-1{{@autoclosure(escaping) is deprecated; use @autoclosure @escaping instead}} {{22-32= @escaping}}
 
 // escaping is the name of param type
 let _ : (@autoclosure(escaping) -> ()) -> ()  // expected-error {{use of undeclared type 'escaping'}}