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

@@ -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

@@ -13,6 +13,9 @@ val c   =    fun()    =  4
 fun test() = fun test() = 4
 
 fun test() {
+    test(fun
+                 () {
+    })
     test(fun test() {})
     test(fun test() = 5)