Fix recursion in contract declaration analysis. KT-26386 Fixed

Issue fixed only in old inference

compiler/testData/diagnostics/testsWithStdLib/contracts/dsl/errors/recursiveContract.kt

@@ -0,0 +1,25 @@
+// !USE_EXPERIMENTAL: kotlin.contracts.ExperimentalContracts
+// !LANGUAGE: +UseReturnsEffect
+// Issue: KT-26386
+
+import kotlin.contracts.*
+
+fun case_1(): Boolean {
+    contract { returns(null) implies <!ERROR_IN_CONTRACT_DESCRIPTION!>case_1()<!> }
+    return true
+}
+
+fun case_2(): Boolean {
+    contract { returns(null) implies <!ERROR_IN_CONTRACT_DESCRIPTION!>case_3()<!> }
+    return true
+}
+
+fun case_3(): Boolean {
+    contract { returns(null) implies <!ERROR_IN_CONTRACT_DESCRIPTION!>case_2()<!> }
+    return true
+}
+
+fun case_4(): Boolean {
+    kotlin.contracts.contract { returns(null) implies <!ERROR_IN_CONTRACT_DESCRIPTION!>case_1()<!> }
+    return true
+}

compiler/testData/diagnostics/testsWithStdLib/contracts/dsl/errors/recursiveContract.txt

@@ -0,0 +1,6 @@
+package
+
+public fun case_1(): kotlin.Boolean
+public fun case_2(): kotlin.Boolean
+public fun case_3(): kotlin.Boolean
+public fun case_4(): kotlin.Boolean

compiler/testData/diagnostics/testsWithStdLib/contracts/dsl/errors/recursiveContractCustomContractFunction.kt

@@ -0,0 +1,39 @@
+// !USE_EXPERIMENTAL: kotlin.contracts.ExperimentalContracts
+// !LANGUAGE: +UseReturnsEffect
+// Issue: KT-26386
+
+fun myRun(block: () -> Unit) {
+    block()
+}
+
+fun contract(block: () -> Unit) {
+    block()
+}
+
+fun case_1(): Boolean? {
+    contract { case_1() }
+    return null
+}
+
+fun case_2(): Boolean? {
+    contract { case_3() }
+    return null
+}
+
+fun case_3(): Boolean? {
+    contract { case_2() }
+    return null
+}
+
+fun case4() {
+    contract {
+        myRun {
+            val s: String
+            run {
+                s = "hello"
+            }
+            s.length
+        }
+    }
+}
+

compiler/testData/diagnostics/testsWithStdLib/contracts/dsl/errors/recursiveContractCustomContractFunction.txt

@@ -0,0 +1,8 @@
+package
+
+public fun case4(): kotlin.Unit
+public fun case_1(): kotlin.Boolean?
+public fun case_2(): kotlin.Boolean?
+public fun case_3(): kotlin.Boolean?
+public fun contract(/*0*/ block: () -> kotlin.Unit): kotlin.Unit
+public fun myRun(/*0*/ block: () -> kotlin.Unit): kotlin.Unit