FE1.0/FIR: add test for "double import" situation

compiler/testData/diagnostics/tests/imports/DoubleImports.fir.kt

@@ -0,0 +1,41 @@
+// FILE: StarImported.kt
+
+package star
+
+class SomeClass
+
+fun foo() {}
+
+val bar = 1
+
+// FILE: ExplicitImported.kt
+
+package explicit
+
+class AnotherClass
+
+fun baz() {}
+
+val gau = 2
+
+// FILE: Test.kt
+
+import star.*
+import star.*
+import explicit.<!CONFLICTING_IMPORT!>AnotherClass<!>
+import explicit.<!CONFLICTING_IMPORT!>AnotherClass<!>
+import explicit.baz
+import explicit.baz
+import explicit.gau
+import explicit.gau
+
+fun useSomeClass(): SomeClass = <!RESOLUTION_TO_CLASSIFIER!>SomeClass<!>()
+
+fun useAnotherClass(): AnotherClass = <!RESOLUTION_TO_CLASSIFIER!>AnotherClass<!>()
+
+fun test() {
+    foo()
+    baz()
+    val x = bar
+    val y = gau
+}

compiler/testData/diagnostics/tests/imports/DoubleImports.kt

@@ -0,0 +1,41 @@
+// FILE: StarImported.kt
+
+package star
+
+class SomeClass
+
+fun foo() {}
+
+val bar = 1
+
+// FILE: ExplicitImported.kt
+
+package explicit
+
+class AnotherClass
+
+fun baz() {}
+
+val gau = 2
+
+// FILE: Test.kt
+
+import star.*
+import star.*
+import explicit.<!CONFLICTING_IMPORT!>AnotherClass<!>
+import explicit.<!CONFLICTING_IMPORT!>AnotherClass<!>
+import explicit.baz
+import explicit.baz
+import explicit.gau
+import explicit.gau
+
+fun useSomeClass(): SomeClass = SomeClass()
+
+fun useAnotherClass(): AnotherClass = AnotherClass()
+
+fun test() {
+    foo()
+    baz()
+    val x = bar
+    val y = gau
+}

compiler/testData/diagnostics/tests/imports/DoubleImports.txt

@@ -0,0 +1,29 @@
+package
+
+public fun test(): kotlin.Unit
+public fun useAnotherClass(): explicit.AnotherClass
+public fun useSomeClass(): star.SomeClass
+
+package explicit {
+    public val gau: kotlin.Int = 2
+    public fun baz(): kotlin.Unit
+
+    public final class AnotherClass {
+        public constructor AnotherClass()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}
+
+package star {
+    public val bar: kotlin.Int = 1
+    public fun foo(): kotlin.Unit
+
+    public final class SomeClass {
+        public constructor SomeClass()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}