Change formatting of function expressions without names

No spaces between 'fun' and value parameter list

idea/src/org/jetbrains/kotlin/idea/formatter/kotlinSpacingRules.kt

@@ -139,6 +139,7 @@ fun createSpacingBuilder(settings: CodeStyleSettings): KotlinSpacingBuilder {
 
             betweenInside(FUN_KEYWORD, IDENTIFIER, FUN).spaces(1)
             betweenInside(FUN_KEYWORD, TYPE_REFERENCE, FUN).spaces(1)
+            betweenInside(FUN_KEYWORD, VALUE_PARAMETER_LIST, FUN).spacing(0, 0, 0, false, 0)
             betweenInside(TYPE_REFERENCE, DOT, FUN).spacing(0, 0, 0, false, 0)
             betweenInside(DOT, IDENTIFIER, FUN).spacing(0, 0, 0, false, 0)
             afterInside(IDENTIFIER, FUN).spacing(0, 0, 0, false, 0)

idea/testData/formatter/FunctionExpression.after.kt

@@ -1,4 +1,4 @@
-val a = fun () {
+val a = fun() {
 }
 val b = fun test() {
 }
@@ -17,6 +17,8 @@ val c = fun() = 4
 fun test() = fun test() = 4
 
 fun test() {
+    test(fun() {
+    })
     test(fun test() {
     })
     test(fun test() = 5)

idea/testData/formatter/FunctionExpression.kt

@@ -1,18 +1,21 @@
 val a = fun () {}
 val b = fun test() {}
 
-val c=fun(){}
+val c=fun  (){}
-val c=fun()=4
+val c=fun  ()=4
 
-val c=fun()=
+val c=fun  ()=
         4
 
 val c   =   fun()   {}
-val c   =    fun()    =  4
+val c   =    fun   ()    =  4
 
 fun test() = fun test() = 4
 
 fun test() {
+    test(fun
+                 () {
+    })
     test(fun test() {})
     test(fun test() = 5)
 

idea/testData/quickfix/migration/lambdaSyntax/lambdaInsideLambda.kt.after

@@ -6,5 +6,5 @@ fun foo(a: Any) {}
 
 val a = foo  a@ {
 
-    val a = fun (): Int = 1
+    val a = fun(): Int = 1
 }

idea/testData/quickfix/migration/lambdaSyntax/lambdaSyntaxMultiple.after.data.Sample.kt

@@ -3,4 +3,4 @@ val h = { -> }
 val l = bar@ fun Int.bar() {
 }
 
-val s = (fun (): Int = 5)()
+val s = (fun(): Int = 5)()

idea/testData/quickfix/migration/lambdaSyntax/lambdaSyntaxMultiple.after.kt

@@ -1,8 +1,8 @@
 // "Migrate lambda syntax in whole project" "true"
 
-val a = fun (): Int {
+val a = fun(): Int {
 
-    val b = fun (): Int = 5
+    val b = fun(): Int = 5
 
     return b()
 }

idea/testData/quickfix/migration/lambdaSyntax/lastStatementIsComment.kt.after

@@ -1,7 +1,7 @@
 // "Migrate lambda syntax" "true"
 
 
-val a = fun (p: Int): String {
+val a = fun(p: Int): String {
     val v = p + 1
     return v.toString()
     // returns v.toString()

idea/tests/org/jetbrains/kotlin/idea/codeInsight/smartEnter/SmartEnterTest.kt

@@ -871,7 +871,7 @@ class SmartEnterTest : JetLightCodeInsightFixtureTestCase() {
             """
             ,
             """
-            fun (p: Int, s: String) {
+            fun(p: Int, s: String) {
                 <caret>
             }
             """
@@ -886,7 +886,7 @@ class SmartEnterTest : JetLightCodeInsightFixtureTestCase() {
             ,
             """
             trait Some {
-                fun (p: Int)
+                fun(p: Int)
                 <caret>
             }
             """
@@ -901,7 +901,7 @@ class SmartEnterTest : JetLightCodeInsightFixtureTestCase() {
             ,
             """
             class Some {
-                abstract fun (p: Int)
+                abstract fun(p: Int)
                 <caret>
             }
             """