Make CharSequence.length a function instead of property

And String.length as well.

This is done for JVM interoperability: java.lang.CharSequence is an open class
and has a function 'length()' which should be implemented in subclasses
somehow.

A minor unexpected effect of this is that String.length() is now a compile-time
constant (it wasn't such as a property because properties are not supported in
compile-time constant evaluation)

 #KT-3571 Fixed

idea/testData/intentions/branched/ifThenToSafeAccess/blockHasMoreThanOneStatement.kt

@@ -5,7 +5,7 @@ fun main(args: Array<String>) {
     val foo: String? = "abc"
     if (foo != null<caret>) {
         doSomething ("Hello")
-        foo.length
+        foo.length()
     }
     else null
 }

idea/testData/intentions/branched/ifThenToSafeAccess/blockUsesDifferentVar.kt

@@ -3,7 +3,7 @@ fun main(args: Array<String>) {
     var foo: String? = "foo"
     var bar: String? = "bar"
     if (foo != null<caret>) {
-        bar?.length
+        bar?.length()
     }
     else null
 }

idea/testData/intentions/branched/ifThenToSafeAccess/conditionComparesNullWithNull.kt

@@ -2,7 +2,7 @@
 fun main(args: Array<String>) {
     val foo = "foo"
     if (null == <caret>null) {
-        foo.length
+        foo.length()
     }
     else null
 }

idea/testData/intentions/branched/ifThenToSafeAccess/conditionInvalidBinaryExp.kt

@@ -4,7 +4,7 @@ fun <T> T.compareTo(a: T): Int = 0
 fun main(args: Array<String>) {
     val foo = "foo"
     if (foo > null<caret>) {
-        foo.length
+        foo.length()
     }
     else null
 }

idea/testData/intentions/branched/ifThenToSafeAccess/conditionNotBinaryExpr.kt

@@ -4,7 +4,7 @@ fun String?.times(a: Int): Boolean = a == 0
 fun main(args: Array<String>) {
     val foo: String = "foo"
     if (foo * 10<caret>) {
-        foo.length
+        foo.length()
     }
     else null
 }

idea/testData/intentions/branched/ifThenToSafeAccess/doesNotinlineValueIfUsedMoreThanOnce.kt

@@ -8,7 +8,7 @@ fun main(args: Array<String>) {
     val foo = maybeFoo()
     doSomething(foo)
     if (foo != null<caret>) {
-        foo.length
+        foo.length()
     }
     else {
         null

idea/testData/intentions/branched/ifThenToSafeAccess/doesNotinlineValueIfUsedMoreThanOnce.kt.after

@@ -7,5 +7,5 @@ fun doSomething<T>(a: T) {}
 fun main(args: Array<String>) {
     val foo = maybeFoo()
     doSomething(foo)
-    foo?.length
+    foo?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/doesNotinlineValueOutsideOfScope.kt

@@ -6,7 +6,7 @@ val x = maybeFoo()
 
 fun main(args: Array<String>) {
     if (x !=<caret> null) {
-        x.length
+        x.length()
     } else {
         null
     }

idea/testData/intentions/branched/ifThenToSafeAccess/doesNotinlineValueOutsideOfScope.kt.after

@@ -5,5 +5,5 @@ fun maybeFoo(): String? {
 val x = maybeFoo()
 
 fun main(args: Array<String>) {
-    x?.length
+    x?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/emptyCondition.kt

@@ -2,7 +2,7 @@
 fun main(args: Array<String>) {
     val foo = "foo"
     if (<caret>) {
-        foo.length
+        foo.length()
     }
     else null
 }

idea/testData/intentions/branched/ifThenToSafeAccess/emptyElseBlock.kt

@@ -5,7 +5,7 @@ fun maybeFoo(): String? {
 fun main(args: Array<String>) {
     val foo = maybeFoo()
     if (foo != null<caret>) {
-        foo.length
+        foo.length()
     }
     else {
 

idea/testData/intentions/branched/ifThenToSafeAccess/emptyElseBlock.kt.after

@@ -3,5 +3,5 @@ fun maybeFoo(): String? {
 }
 
 fun main(args: Array<String>) {
-    maybeFoo()?.length
+    maybeFoo()?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/emptyThenBlock.kt

@@ -7,6 +7,6 @@ fun main(args: Array<String>) {
     if (foo == null<caret>) {
     }
     else {
-        foo.length
+        foo.length()
     }
 }

idea/testData/intentions/branched/ifThenToSafeAccess/emptyThenBlock.kt.after

@@ -3,5 +3,5 @@ fun maybeFoo(): String? {
 }
 
 fun main(args: Array<String>) {
-    maybeFoo()?.length
+    maybeFoo()?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/ifAndElseBothInBlocks.kt

@@ -5,7 +5,7 @@ fun maybeFoo(): String? {
 fun main(args: Array<String>) {
     val foo = maybeFoo()
     if (foo != null<caret>) {
-        foo.length
+        foo.length()
     }
     else {
         null

idea/testData/intentions/branched/ifThenToSafeAccess/ifAndElseBothInBlocks.kt.after

@@ -3,5 +3,5 @@ fun maybeFoo(): String? {
 }
 
 fun main(args: Array<String>) {
-    maybeFoo()?.length
+    maybeFoo()?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/ifAndElseNotInBlocks.kt

@@ -5,7 +5,7 @@ fun maybeFoo(): String? {
 fun main(args: Array<String>) {
     val foo = maybeFoo()
     if (foo != null<caret>)
-        foo.length
+        foo.length()
     else
         null
 }

idea/testData/intentions/branched/ifThenToSafeAccess/ifAndElseNotInBlocks.kt.after

@@ -3,5 +3,5 @@ fun maybeFoo(): String? {
 }
 
 fun main(args: Array<String>) {
-    maybeFoo()?.length
+    maybeFoo()?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/ifAsExpression.kt

@@ -8,6 +8,6 @@ fun main(args: Array<String>) {
         null
     }
     else {
-        foo.length
+        foo.length()
     }
 }

idea/testData/intentions/branched/ifThenToSafeAccess/ifAsExpression.kt.after

@@ -3,5 +3,5 @@ fun maybeFoo(): String? {
 }
 
 fun main(args: Array<String>) {
-    val x = maybeFoo()?.length
+    val x = maybeFoo()?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/lhsEqualsNull.kt

@@ -7,5 +7,5 @@ fun main(args: Array<String>) {
     if (foo == null<caret>)
         null
     else
-        foo.length
+        foo.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/lhsEqualsNull.kt.after

@@ -3,5 +3,5 @@ fun maybeFoo(): String? {
 }
 
 fun main(args: Array<String>) {
-    maybeFoo()?.length
+    maybeFoo()?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/lhsNotEqualsNull.kt

@@ -5,7 +5,7 @@ fun maybeFoo(): String? {
 fun main(args: Array<String>) {
     val foo = maybeFoo()
     if (foo != null<caret>)
-        foo.length
+        foo.length()
     else
         null
 }

idea/testData/intentions/branched/ifThenToSafeAccess/lhsNotEqualsNull.kt.after

@@ -3,5 +3,5 @@ fun maybeFoo(): String? {
 }
 
 fun main(args: Array<String>) {
-    maybeFoo()?.length
+    maybeFoo()?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/noCondition.kt

@@ -3,6 +3,6 @@
 fun main(args: Array<String>) {
     val foo: String? = "foo"
     if<caret> {
-        foo.length
+        foo.length()
     } else null
 }

idea/testData/intentions/branched/ifThenToSafeAccess/noElseBlock.kt

@@ -5,6 +5,6 @@ fun maybeFoo(): String? {
 fun main(args: Array<String>) {
     val foo = maybeFoo()
     if (foo != null<caret>) {
-        foo.length
+        foo.length()
     }
 }

idea/testData/intentions/branched/ifThenToSafeAccess/noElseBlock.kt.after

@@ -3,5 +3,5 @@ fun maybeFoo(): String? {
 }
 
 fun main(args: Array<String>) {
-    maybeFoo()?.length
+    maybeFoo()?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/noNullInCondition.kt

@@ -3,7 +3,7 @@ fun main(args: Array<String>) {
     val foo: String? = "foo"
     val bar: String? = null
     if (foo == bar<caret>) {
-        foo?.length
+        foo?.length()
     }
     else null
 }

idea/testData/intentions/branched/ifThenToSafeAccess/noNullInCondition2.kt

@@ -3,7 +3,7 @@ fun main(args: Array<String>) {
     val foo: String? = "foo"
     val bar: String? = null
     if (foo == bar<caret>) {
-        bar?.length
+        bar?.length()
     }
     else null
 }

idea/testData/intentions/branched/ifThenToSafeAccess/noThenBlock.kt

@@ -5,6 +5,6 @@ fun maybeFoo(): String? {
 fun main(args: Array<String>) {
     val foo = maybeFoo()
     if (foo == null<caret>) else {
-        foo.length
+        foo.length()
     }
 }

idea/testData/intentions/branched/ifThenToSafeAccess/noThenBlock.kt.after

@@ -3,5 +3,5 @@ fun maybeFoo(): String? {
 }
 
 fun main(args: Array<String>) {
-    maybeFoo()?.length
+    maybeFoo()?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/notApplicableForFunction.kt

@@ -7,5 +7,5 @@ fun main(args: Array<String>) {
     if (maybeFoo() == null<caret>)
         null
     else
-        maybeFoo()?.length
+        maybeFoo()?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/notApplicableForLocalVar.kt

@@ -8,5 +8,5 @@ fun main(args: Array<String>) {
     if (foo == null<caret>)
         null
     else
-        foo?.length
+        foo?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/otherBlockHasMoreThanOneStatement.kt

@@ -4,7 +4,7 @@ fun doSomething<T>(a: T) {}
 fun main(args: Array<String>) {
     val foo: String? = "abc"
     if (foo != null<caret>) {
-        foo.length
+        foo.length()
     }
     else {
         doSomething("Hi")

idea/testData/intentions/branched/ifThenToSafeAccess/rhsEqualsNull.kt

@@ -7,5 +7,5 @@ fun main(args: Array<String>) {
     if (null == foo<caret>)
         null
     else
-        foo.length
+        foo.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/rhsEqualsNull.kt.after

@@ -3,5 +3,5 @@ fun maybeFoo(): String? {
 }
 
 fun main(args: Array<String>) {
-    maybeFoo()?.length
+    maybeFoo()?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/rhsNotEqualsNull.kt

@@ -5,7 +5,7 @@ fun maybeFoo(): String? {
 fun main(args: Array<String>) {
     val foo = maybeFoo()
     if (null != foo<caret>)
-        foo.length
+        foo.length()
     else
         null
 }

idea/testData/intentions/branched/ifThenToSafeAccess/rhsNotEqualsNull.kt.after

@@ -3,5 +3,5 @@ fun maybeFoo(): String? {
 }
 
 fun main(args: Array<String>) {
-    maybeFoo()?.length
+    maybeFoo()?.length()
 }

idea/testData/intentions/branched/ifThenToSafeAccess/thenAndElseNotNull.kt

@@ -3,9 +3,9 @@
 fun main(args: Array<String>) {
     val foo: String? = "foo"
     if (foo == null<caret>) {
-        foo.length
+        foo.length()
     }
     else {
-        foo.length
+        foo.length()
     }
 }

idea/testData/intentions/branched/safeAccessToIfThen/binaryExpressionLhs.kt

@@ -1,5 +1,5 @@
 fun main(args: Array<String>) {
     val x: String? = null
     val y: String? = "Hello"
-    val z = (x ?: y)?.<caret>length
+    val z = (x ?: y)?.<caret>length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/binaryExpressionLhs.kt.after

@@ -2,5 +2,5 @@ fun main(args: Array<String>) {
     val x: String? = null
     val y: String? = "Hello"
     val s = x ?: y
-    val z = if (s != null) s.length else null
+    val z = if (s != null) s.length() else null
 }

idea/testData/intentions/branched/safeAccessToIfThen/callExpression.kt

@@ -1,5 +1,3 @@
-fun String.length() = length
-
 fun foo(): String? = "foo"
 fun main(args: Array<String>) {
     foo()?.<caret>length()

idea/testData/intentions/branched/safeAccessToIfThen/callExpression.kt.after

@@ -1,5 +1,3 @@
-fun String.length() = length
-
 fun foo(): String? = "foo"
 fun main(args: Array<String>) {
     val s = foo()

idea/testData/intentions/branched/safeAccessToIfThen/callExpressionParens.kt

@@ -1,4 +1,4 @@
 fun foo(): String? = "foo"
 fun main(args: Array<String>) {
-    (foo())?.<caret>length
+    (foo())?.<caret>length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/callExpressionParens.kt.after

@@ -1,5 +1,5 @@
 fun foo(): String? = "foo"
 fun main(args: Array<String>) {
     val s = foo()
-    if (s != null) s.length
+    if (s != null) s.length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/customGetterAsReceiver.kt

@@ -9,5 +9,5 @@ class Foo {
 
 fun main(args: Array<String>) {
     val a = Foo()
-    doSomething(a.b?.<caret>length)
+    doSomething(a.b?.<caret>length())
 }

idea/testData/intentions/branched/safeAccessToIfThen/customGetterAsReceiver.kt.after

@@ -10,5 +10,5 @@ class Foo {
 fun main(args: Array<String>) {
     val a = Foo()
     val s = a.b
-    doSomething(if (s != null) s.length else null)
+    doSomething(if (s != null) s.length() else null)
 }

idea/testData/intentions/branched/safeAccessToIfThen/localValAsReceiver.kt

@@ -1,4 +1,4 @@
 fun main(args: Array<String>) {
     val x: String? = "abc"
-    x?.<caret>length
+    x?.<caret>length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/localValAsReceiver.kt.after

@@ -1,4 +1,4 @@
 fun main(args: Array<String>) {
     val x: String? = "abc"
-    if (x != null) x.length
+    if (x != null) x.length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/localValLhs.kt

@@ -2,5 +2,5 @@ fun doSomething<T>(a: T) {}
 
 fun main(args: Array<String>) {
     val a: String? = "A"
-    doSomething(a?.<caret>length)
+    doSomething(a?.<caret>length())
 }

idea/testData/intentions/branched/safeAccessToIfThen/localValLhs.kt.after

@@ -2,5 +2,5 @@ fun doSomething<T>(a: T) {}
 
 fun main(args: Array<String>) {
     val a: String? = "A"
-    doSomething(if (a != null) a.length else null)
+    doSomething(if (a != null) a.length() else null)
 }

idea/testData/intentions/branched/safeAccessToIfThen/localVarLhs.kt

@@ -2,6 +2,6 @@ fun doSomething<T>(a: T) {}
 
 fun main(args: Array<String>) {
     var a: String? = "A"
-    doSomething(a?.<caret>length)
+    doSomething(a?.<caret>length())
 }
 

idea/testData/intentions/branched/safeAccessToIfThen/localVarLhs.kt.after

@@ -3,6 +3,6 @@ fun doSomething<T>(a: T) {}
 fun main(args: Array<String>) {
     var a: String? = "A"
     val s = a
-    doSomething(if (s != null) s.length else null)
+    doSomething(if (s != null) s.length() else null)
 }
 

idea/testData/intentions/branched/safeAccessToIfThen/resultAssignedToLocalVal.kt

@@ -1,4 +1,4 @@
 fun main(args: Array<String>) {
     val x: String? = "abc"
-    val y = x?.<caret>length
+    val y = x?.<caret>length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/resultAssignedToLocalVal.kt.after

@@ -1,4 +1,4 @@
 fun main(args: Array<String>) {
     val x: String? = "abc"
-    val y = if (x != null) x.length else null
+    val y = if (x != null) x.length() else null
 }

idea/testData/intentions/branched/safeAccessToIfThen/safeAccessAsFunctionArgument.kt

@@ -3,5 +3,5 @@ fun f(s: Int?) {
 
 fun main(args: Array<String>) {
     val x: String? = "foo"
-    f(x?.<caret>length)
+    f(x?.<caret>length())
 }

idea/testData/intentions/branched/safeAccessToIfThen/safeAccessAsFunctionArgument.kt.after

@@ -3,5 +3,5 @@ fun f(s: Int?) {
 
 fun main(args: Array<String>) {
     val x: String? = "foo"
-    f(if (x != null) x.length else null)
+    f(if (x != null) x.length() else null)
 }

idea/testData/intentions/branched/safeAccessToIfThen/simpleNameExpression.kt

@@ -1,4 +1,4 @@
 fun main(args: Array<String>) {
     val foo: String? = "foo"
-    foo?.<caret>length
+    foo?.<caret>length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/simpleNameExpression.kt.after

@@ -1,4 +1,4 @@
 fun main(args: Array<String>) {
     val foo: String? = "foo"
-    if (foo != null) foo.length
+    if (foo != null) foo.length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/simpleNameExpressionInParens.kt

@@ -1,4 +1,4 @@
 fun main(args: Array<String>) {
     val foo: String? = "foo"
-    (foo)?.<caret>length
+    (foo)?.<caret>length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/simpleNameExpressionInParens.kt.after

@@ -1,4 +1,4 @@
 fun main(args: Array<String>) {
     val foo: String? = "foo"
-    if (foo != null) foo.length
+    if (foo != null) foo.length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/topLevelVal.kt

@@ -2,5 +2,5 @@ fun doSomething<T>(a: T) {}
 
 val a: String? = "A"
 fun main(args: Array<String>) {
-    doSomething(a?.<caret>length)
+    doSomething(a?.<caret>length())
 }

idea/testData/intentions/branched/safeAccessToIfThen/topLevelVal.kt.after

@@ -2,5 +2,5 @@ fun doSomething<T>(a: T) {}
 
 val a: String? = "A"
 fun main(args: Array<String>) {
-    doSomething(if (a != null) a.length else null)
+    doSomething(if (a != null) a.length() else null)
 }

idea/testData/intentions/branched/safeAccessToIfThen/topLevelValCustomGetter.kt

@@ -4,5 +4,5 @@ val a: String?
     get() = ""
 
 fun main(args: Array<String>) {
-    doSomething(a?.<caret>length)
+    doSomething(a?.<caret>length())
 }

idea/testData/intentions/branched/safeAccessToIfThen/topLevelValCustomGetter.kt.after

@@ -5,5 +5,5 @@ val a: String?
 
 fun main(args: Array<String>) {
     val s = a
-    doSomething(if (s != null) s.length else null)
+    doSomething(if (s != null) s.length() else null)
 }

idea/testData/intentions/branched/safeAccessToIfThen/topLevelVar.kt

@@ -1,4 +1,4 @@
 var a: String? = "A"
 fun main(args: Array<String>) {
-    a<caret>?.length
+    a<caret>?.length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/topLevelVar.kt.after

@@ -1,5 +1,5 @@
 var a: String? = "A"
 fun main(args: Array<String>) {
     val s = a
-    if (s != null) s.length
+    if (s != null) s.length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/topLevelVarCustomGetter.kt

@@ -3,5 +3,5 @@ var a: String?
     set(v) {}
 
 fun main(args: Array<String>) {
-    a?.<caret>length
+    a?.<caret>length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/topLevelVarCustomGetter.kt.after

@@ -4,5 +4,5 @@ var a: String?
 
 fun main(args: Array<String>) {
     val s = a
-    if (s != null) s.length
+    if (s != null) s.length()
 }

idea/testData/intentions/branched/safeAccessToIfThen/usedAsFunctionRhs.kt

@@ -1,4 +1,4 @@
-fun foo(arg: String?): Int? = arg?.<caret>length
+fun foo(arg: String?): Int? = arg?.<caret>length()
 fun main(args: Array<String>) {
     foo("bar")
 }

idea/testData/intentions/branched/safeAccessToIfThen/usedAsFunctionRhs.kt.after

@@ -1,4 +1,4 @@
-fun foo(arg: String?): Int? = if (arg != null) arg.length else null
+fun foo(arg: String?): Int? = if (arg != null) arg.length() else null
 fun main(args: Array<String>) {
     foo("bar")
 }

idea/testData/intentions/branched/safeAccessToIfThen/usedAsResultOfCheckedIf.kt

@@ -1,4 +1,4 @@
 fun main(args: Array<String>) {
     val foo: String? = "foo"
-    val y = if (true) foo?.<caret>length else null
+    val y = if (true) foo?.<caret>length() else null
 }

idea/testData/intentions/branched/safeAccessToIfThen/usedAsResultOfCheckedIf.kt.after

@@ -1,4 +1,4 @@
 fun main(args: Array<String>) {
     val foo: String? = "foo"
-    val y = if (true) if (foo != null) foo.length else null else null
+    val y = if (true) if (foo != null) foo.length() else null else null
 }

idea/testData/intentions/branched/safeAccessToIfThen/usedAsReturnValue.kt

@@ -1,6 +1,6 @@
 fun doSth(): Int? {
     val x: String? = "abc"
-    return x?.<caret>length
+    return x?.<caret>length()
 }
 fun main(args: Array<String>) {
     val y = doSth()

idea/testData/intentions/branched/safeAccessToIfThen/usedAsReturnValue.kt.after

@@ -1,6 +1,6 @@
 fun doSth(): Int? {
     val x: String? = "abc"
-    return if (x != null) x.length else null
+    return if (x != null) x.length() else null
 }
 fun main(args: Array<String>) {
     val y = doSth()

idea/testData/intentions/branched/safeAccessToIfThen/usedInUncheckedIfExpression.kt

@@ -1,6 +1,6 @@
 fun main(args: Array<String>) {
     val foo: String? = "foo"
     if (true) {
-        foo?.<caret>length
+        foo?.<caret>length()
     }
 }

idea/testData/intentions/branched/safeAccessToIfThen/usedInUncheckedIfExpression.kt.after

@@ -1,6 +1,6 @@
 fun main(args: Array<String>) {
     val foo: String? = "foo"
     if (true) {
-        if (foo != null) foo.length
+        if (foo != null) foo.length()
     }
 }

idea/testData/intentions/convertNegatedExpressionWithDemorgansLaw/doubleNegation.kt

@@ -1,5 +1,5 @@
 fun String.not(): Boolean {
-    return length == 0
+    return length() == 0
 }
 
 fun foo(a: Boolean, b: Boolean) : Boolean {

idea/testData/intentions/convertNegatedExpressionWithDemorgansLaw/doubleNegation.kt.after

@@ -1,5 +1,5 @@
 fun String.not(): Boolean {
-    return length == 0
+    return length() == 0
 }
 
 fun foo(a: Boolean, b: Boolean) : Boolean {

idea/testData/intentions/removeCurlyBracesFromTemplate/necessaryBrackets1.kt

@@ -1,5 +1,5 @@
 // IS_APPLICABLE: false
 fun foo() {
     val x = "x"
-    val y = "$<caret>{x.length}"
+    val y = "$<caret>{x.length()}"
 }

idea/testData/intentions/replaceWithInfixFunctionCall/propertyAccess.kt

@@ -1,4 +1,4 @@
 // IS_APPLICABLE: false
-fun foo(x: String) {
-    x.<caret>length
+fun foo(x: IntRange) {
+    x.<caret>start
 }