lvti: reject initializing var with void (IDEA-188623)

java/java-analysis-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightUtil.java

@@ -462,6 +462,12 @@ public class HighlightUtil extends HighlightUtilBase {
             .descriptionAndTooltip("Cannot infer type: variable initializer is 'null'")
             .range(typeElement).create();
         }
+
+        if (PsiType.VOID.equals(lType)) {
+          return HighlightInfo.newHighlightInfo(HighlightInfoType.ERROR)
+            .descriptionAndTooltip("Cannot infer type: variable initializer is 'void'")
+            .range(typeElement).create();
+        }
       }
     }
     return null;

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advLVTI/SimpleAvailability.java

@@ -33,6 +33,8 @@ class Main {
         var runnable = true ? <error descr="Lambda expression not expected here">() -> {}</error> : <error descr="Lambda expression not expected here">() -> {}</error>;
 
         Function<String, String> f1 = (<error descr="Cannot resolve symbol 'var'">var</error> var) -> var;
+
+        <error descr="Cannot infer type: variable initializer is 'void'">var</error> h = localVariableDeclaration();
     }
 
     private void forEachType(String[] strs, Iterable<String> it, Iterable raw) {