add check for escaped identifiers

compiler/testData/diagnostics/tests/BacktickNames.kt

@@ -0,0 +1,98 @@
+//  !DIAGNOSTICS: -UNUSED_VARIABLE -UNUSED_PARAMETER
+// TODO Uncomment all the examples when there will be no problems with light classes
+//package `foo.bar`
+
+// TODO: Uncomment after fixing KT-9416
+//import kotlin.Deprecated as `deprecate\entity`
+
+//@`deprecate\entity`("") data class Pair(val x: Int, val y: Int)
+
+// Names should not contains characters: '.', ';', '[', ']', '/', '<', '>', ':', '\\'
+//class `class.name`
+class <!INVALID_CHARACTERS!>`class;name`<!>
+class <!INVALID_CHARACTERS!>`class[name`<!>
+class <!INVALID_CHARACTERS!>`class]name`<!>
+//class `class/name`
+class <!INVALID_CHARACTERS!>`class<name`<!>
+class <!INVALID_CHARACTERS!>`class>name`<!>
+class <!INVALID_CHARACTERS!>`class:name`<!>
+class <!INVALID_CHARACTERS!>`class\name`<!>
+
+class ` ` {}
+class `  `
+
+//val `val.X` = 10
+val <!INVALID_CHARACTERS!>`val;X`<!> = 10
+val <!INVALID_CHARACTERS!>`val[X`<!> = 10
+val <!INVALID_CHARACTERS!>`val]X`<!> = 10
+//val `val/X` = 10
+val <!INVALID_CHARACTERS!>`val<X`<!> = 10
+val <!INVALID_CHARACTERS!>`val>X`<!> = 10
+val <!INVALID_CHARACTERS!>`val:X`<!> = 10
+val <!INVALID_CHARACTERS!>`val\X`<!> = 10
+
+val <!INVALID_CHARACTERS!>`;`<!> = 1
+val <!INVALID_CHARACTERS!>`[`<!> = 2
+val <!INVALID_CHARACTERS!>`]`<!> = 3
+// org.jetbrains.kotlin.resolve.lazy.NoDescriptorForDeclarationException: Descriptor wasn't found for declaration PROPERTY
+// Names which start with '<' are treated as "special": see Name.java
+//val `<` = 4
+
+val <!INVALID_CHARACTERS!>`>`<!> = 5
+val <!INVALID_CHARACTERS!>`:`<!> = 6
+val <!INVALID_CHARACTERS!>`\`<!> = 7
+// org.jetbrains.kotlin.resolve.lazy.NoDescriptorForDeclarationException: Descriptor wasn't found for declaration PROPERTY
+// Names which start with '<' are treated as "special": see Name.java
+//val `<>` = 8
+
+val <!INVALID_CHARACTERS!>`[]`<!> = 9
+val <!INVALID_CHARACTERS!>`[;]`<!> = 10
+
+// TODO Uncomment when there will be no problems with light classes (Error: Invalid formal type parameter (must be a valid Java identifier))
+//class AWithTypeParameter<`T:K`> {}
+//fun <`T/K`> genericFun(x: `T/K`) {}
+
+class B(val <!INVALID_CHARACTERS!>`a:b`<!>: Int, val <!INVALID_CHARACTERS!>`c:d`<!>: Int)
+
+val ff: (<!INVALID_CHARACTERS!>`x:X`<!>: Int) -> Unit = {}
+val fg: ((<!INVALID_CHARACTERS!>`x:X`<!>: Int) -> Unit) -> Unit = {}
+val fh: ((Int) -> ((<!INVALID_CHARACTERS!>`x:X`<!>: Int) -> Unit) -> Unit) = {{}}
+
+fun f(x: Int, g: (Int) -> Unit) = g(x)
+
+data class Data(val x: Int,  val y: Int)
+
+class A() {
+    init {
+        val <!INVALID_CHARACTERS!>`a:b`<!> = 10
+    }
+
+    fun g(<!INVALID_CHARACTERS!>`x:y`<!>: Int) {
+        val <!INVALID_CHARACTERS!>`s:`<!> = 30
+    }
+}
+
+fun <!INVALID_CHARACTERS!>`foo:bar`<!>(<!INVALID_CHARACTERS!>`\arg`<!>: Int): Int {
+    val (<!INVALID_CHARACTERS!>`a:b`<!>, c) = Data(10, 20)
+    val <!INVALID_CHARACTERS!>`a\b`<!> = 10
+
+    fun localFun() {}
+
+    for (<!INVALID_CHARACTERS!>`x/y`<!> in 0..10) {
+    }
+
+    f(10) {
+        <!INVALID_CHARACTERS!>`x:z`<!>: Int -> localFun()
+    }
+
+    f(20, fun(<!INVALID_CHARACTERS!>`x:z`<!>: Int): Unit {})
+
+    try {
+        val <!INVALID_CHARACTERS!>`a:`<!> = 10
+    }
+    catch (<!INVALID_CHARACTERS!>`e:a`<!>: Exception) {
+        val <!INVALID_CHARACTERS!>`b:`<!> = 20
+    }
+
+    return `\arg`
+}