Add more tests for header compilation.

^KT-78422

Author: aviroop-123

compiler/fir/analysis-tests/testData/resolve/headerMode/classDeclaration.fir.txt

@@ -21,6 +21,12 @@ FILE: classDeclaration.kt
 
         public final fun funD(): R|kotlin/Int|
 
+        public final inline fun funE(): R|kotlin/String| {
+            local final fun funF(): R|kotlin/String|
+
+            ^funE R|<local>/funF|()
+        }
+
     }
     public abstract interface B : R|kotlin/Any| {
         public open fun funA(): R|kotlin/String|

compiler/fir/analysis-tests/testData/resolve/headerMode/classDeclaration.kt

@@ -25,6 +25,11 @@ class A {
     }
 
     fun funD() = 1 + 2
+
+    inline fun funE(): String {
+        fun funF() = "funF body"
+        return funF()
+    }
 }
 
 interface B {

compiler/fir/analysis-tests/testData/resolve/headerMode/functionDeclaration.fir.txt

@@ -11,3 +11,23 @@ FILE: functionDeclaration.kt
 
     private final fun funC(): R|kotlin/String|
     public final fun funD(): R|kotlin/Int|
+    public final inline fun funE(): R|kotlin/String| {
+        local final fun funF(): R|kotlin/String|
+
+        ^funE R|<local>/funF|()
+    }
+    public final inline fun funG(): R|kotlin/String| {
+        local final class classA : R|kotlin/Any| {
+            public constructor(): R|<local>/classA| {
+                super<R|kotlin/Any|>()
+            }
+
+            public final fun funH(): R|kotlin/String|
+
+        }
+
+        lval a: R|<local>/classA| = R|<local>/classA.classA|()
+        ^funG R|<local>/a|.R|<local>/funH|()
+    }
+    public final fun funI(): R|kotlin/Int|
+    public final fun funJ(): R|kotlin/String|

compiler/fir/analysis-tests/testData/resolve/headerMode/functionDeclaration.kt

@@ -3,14 +3,17 @@
 import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.contract
 
+// Public function
 fun funA(): String {
     return "funA body"
 }
 
+// Inline function
 inline fun funB(): String {
     return "funB body"
 }
 
+// Function with contract
 @OptIn(ExperimentalContracts::class)
 fun isNotNull(value: Any?): Boolean {
     contract {
@@ -19,11 +22,38 @@ fun isNotNull(value: Any?): Boolean {
     return value != null
 }
 
+// Private function
 private fun funC(): String {
     return "funC body"
 }
 
+// Implicit return type
 fun funD() = 1 + 2
 
+// Function inside a function
+inline fun funE(): String {
+    fun funF(): String {
+        return "funF body"
+    }
+    return funF()
+}
+
+// Class inside a function
+inline fun funG(): String {
+    class classA {
+        fun funH() = "funH body"
+    }
+    val a = classA()
+    return a.funH()
+}
+
+// Implicit type reference from another function.
+fun funI() = funD()
+
+fun funJ(): String {
+    inline fun funK() = "funK body"
+    return funK()
+}
+
 /* GENERATED_FIR_TAGS: classReference, contractConditionalEffect, contracts, functionDeclaration, inline, nullableType,
 stringLiteral */

compiler/fir/analysis-tests/testData/resolve/headerMode/objectDeclaration.fir.txt

@@ -21,4 +21,10 @@ FILE: objectDeclaration.kt
 
         public final fun funD(): R|kotlin/Int|
 
+        public final inline fun funE(): R|kotlin/String| {
+            local final fun funF(): R|kotlin/String|
+
+            ^funE R|<local>/funF|()
+        }
+
     }

compiler/fir/analysis-tests/testData/resolve/headerMode/objectDeclaration.kt

@@ -25,6 +25,11 @@ object A {
     }
 
     fun funD() = 1 + 2
+
+    inline fun funE(): String {
+        fun funF() = "funF body"
+        return funF()
+    }
 }
 
 /* GENERATED_FIR_TAGS: classReference, contractConditionalEffect, contracts, functionDeclaration, inline, nullableType,