KT-8275 Unterminated multi-line comment should be compilation error

#KT-8275 fixed

compiler/frontend/src/org/jetbrains/kotlin/parsing/KotlinParsing.java

@@ -17,6 +17,7 @@
 package org.jetbrains.kotlin.parsing;
 
 import com.intellij.lang.PsiBuilder;
+import com.intellij.lang.WhitespacesBinders;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.psi.tree.IElementType;
 import com.intellij.psi.tree.TokenSet;
@@ -112,9 +113,23 @@ public class KotlinParsing extends AbstractKotlinParsing {
             parseTopLevelDeclaration();
         }
 
+        checkUnclosedBlockComment();
         fileMarker.done(KT_FILE);
     }
 
+    private void checkUnclosedBlockComment() {
+        if (TokenSet.create(BLOCK_COMMENT, DOC_COMMENT).contains(myBuilder.rawLookup(-1))) {
+            int startOffset = myBuilder.rawTokenTypeStart(-1);
+            int endOffset = myBuilder.rawTokenTypeStart(0);
+            CharSequence tokenChars = myBuilder.getOriginalText().subSequence(startOffset, endOffset);
+            if (!(tokenChars.length() > 2 && tokenChars.subSequence(tokenChars.length() - 2, tokenChars.length()).toString().equals("*/"))) {
+                PsiBuilder.Marker marker = myBuilder.mark();
+                marker.error("Unclosed comment");
+                marker.setCustomEdgeTokenBinders(WhitespacesBinders.GREEDY_RIGHT_BINDER, null);
+            }
+        }
+    }
+
     void parseTypeCodeFragment() {
         PsiBuilder.Marker marker = mark();
         parseTypeRef();

compiler/testData/psi/BlockCommentAtBeginningOfFile1.txt

@@ -4,3 +4,5 @@ JetFile: BlockCommentAtBeginningOfFile1.kt
   IMPORT_LIST
     <empty list>
   PsiComment(BLOCK_COMMENT)('/*')
+  PsiErrorElement:Unclosed comment
+    <empty list>

compiler/testData/psi/BlockCommentAtBeginningOfFile2.txt

@@ -4,3 +4,5 @@ JetFile: BlockCommentAtBeginningOfFile2.kt
   IMPORT_LIST
     <empty list>
   PsiComment(BLOCK_COMMENT)('/*\n/*')
+  PsiErrorElement:Unclosed comment
+    <empty list>

compiler/testData/psi/BlockCommentAtBeginningOfFile3.txt

@@ -4,3 +4,5 @@ JetFile: BlockCommentAtBeginningOfFile3.kt
   IMPORT_LIST
     <empty list>
   PsiComment(BLOCK_COMMENT)('/*\n\nfooo')
+  PsiErrorElement:Unclosed comment
+    <empty list>

compiler/testData/psi/BlockCommentAtBeginningOfFile4.txt

@@ -4,3 +4,5 @@ JetFile: BlockCommentAtBeginningOfFile4.kt
   IMPORT_LIST
     <empty list>
   PsiComment(BLOCK_COMMENT)('/*\n\n/*foo*/\n\nasdfas')
+  PsiErrorElement:Unclosed comment
+    <empty list>

compiler/testData/psi/BlockCommentUnmatchedClosing_ERR.kt

@@ -0,0 +1,3 @@
+fun f() {
+    */
+}

compiler/testData/psi/BlockCommentUnmatchedClosing_ERR.txt

@@ -0,0 +1,22 @@
+JetFile: BlockCommentUnmatchedClosing_ERR.kt
+  PACKAGE_DIRECTIVE
+    <empty list>
+  IMPORT_LIST
+    <empty list>
+  FUN
+    PsiElement(fun)('fun')
+    PsiWhiteSpace(' ')
+    PsiElement(IDENTIFIER)('f')
+    VALUE_PARAMETER_LIST
+      PsiElement(LPAR)('(')
+      PsiElement(RPAR)(')')
+    PsiWhiteSpace(' ')
+    BLOCK
+      PsiElement(LBRACE)('{')
+      PsiWhiteSpace('\n    ')
+      PsiErrorElement:Expecting an element
+        PsiElement(MUL)('*')
+      PsiErrorElement:Unexpected tokens (use ';' to separate expressions on the same line)
+        PsiElement(DIV)('/')
+      PsiWhiteSpace('\n')
+      PsiElement(RBRACE)('}')

compiler/testData/psi/kdoc/DocCommentAtBeginningOfFile1.txt

@@ -7,3 +7,5 @@ JetFile: DocCommentAtBeginningOfFile1.kt
     PsiElement(KDOC_START)('/**')
     KDOC_SECTION
       <empty list>
+  PsiErrorElement:Unclosed comment
+    <empty list>

compiler/testData/psi/kdoc/DocCommentAtBeginningOfFile2.txt

@@ -8,3 +8,5 @@ JetFile: DocCommentAtBeginningOfFile2.kt
     PsiWhiteSpace('\n')
     KDOC_SECTION
       PsiElement(KDOC_TEXT)('/**')
+  PsiErrorElement:Unclosed comment
+    <empty list>

compiler/testData/psi/kdoc/DocCommentAtBeginningOfFile3.txt

@@ -8,3 +8,5 @@ JetFile: DocCommentAtBeginningOfFile3.kt
     PsiWhiteSpace('\n\n')
     KDOC_SECTION
       PsiElement(KDOC_TEXT)('fooo')
+  PsiErrorElement:Unclosed comment
+    <empty list>

compiler/testData/psi/kdoc/DocCommentAtBeginningOfFile4.txt

@@ -10,3 +10,5 @@ JetFile: DocCommentAtBeginningOfFile4.kt
       PsiElement(KDOC_TEXT)('/**foo*/')
       PsiWhiteSpace('\n\n')
       PsiElement(KDOC_TEXT)('asdfas')
+  PsiErrorElement:Unclosed comment
+    <empty list>

compiler/testData/psi/kdoc/Incomplete.txt

@@ -8,3 +8,5 @@ JetFile: Incomplete.kt
     PsiWhiteSpace('\n      ')
     KDOC_SECTION
       PsiElement(KDOC_TEXT)('contents')
+  PsiErrorElement:Unclosed comment
+    <empty list>

compiler/tests/org/jetbrains/kotlin/parsing/ParsingTestGenerated.java

@@ -97,6 +97,12 @@ public class ParsingTestGenerated extends AbstractParsingTest {
             doParsingTest(fileName);
         }
 
+        @TestMetadata("BlockCommentUnmatchedClosing_ERR.kt")
+        public void testBlockCommentUnmatchedClosing_ERR() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/psi/BlockCommentUnmatchedClosing_ERR.kt");
+            doParsingTest(fileName);
+        }
+
         @TestMetadata("ByClauses.kt")
         public void testByClauses() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/psi/ByClauses.kt");