Fix StringIndexOutOfBoundsException

#EA-72837 Fixed

compiler/testData/diagnostics/tests/regressions/ea72837.kt

@@ -0,0 +1,9 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+fun <T> g(x: T) = 1
+fun h(x: () -> Unit) = 1
+
+fun foo() {
+    <!UNRESOLVED_REFERENCE!>f<!>(::<!SYNTAX!><!>)
+    g(::<!SYNTAX!><!>)
+    h(::<!SYNTAX!><!>)
+}

compiler/testData/diagnostics/tests/regressions/ea72837.txt

@@ -0,0 +1,5 @@
+package
+
+public fun foo(): kotlin.Unit
+public fun </*0*/ T> g(/*0*/ x: T): kotlin.Int
+public fun h(/*0*/ x: () -> kotlin.Unit): kotlin.Int