GROOVY-10236

Author: eric-milles

base-test/org.eclipse.jdt.groovy.core.tests.compiler/src/org/eclipse/jdt/groovy/core/tests/basic/GroovySimpleTests.java

@@ -525,7 +525,7 @@ public void testLambdaBasic() {
             "Supplier<String> s = () -> 'hello'\n" +
             "print s.get()\n" +
             "\n" +
-            "Consumer<String> c = x -> print(x)\n" +
+            "Consumer<String> c = (x -> print x)\n" + // GROOVY-10236
             "c.accept(' ')\n" +
             "\n" +
             "Function<Integer, String> f = (Integer i) -> { 'world' }\n" +

base/org.codehaus.groovy40/src/GroovyParser.g4

@@ -486,7 +486,7 @@ standardLambdaParameters
 
 lambdaBody
     :   block
-    |   expression
+    |   statementExpression
     ;
 
 // CLOSURE

base/org.codehaus.groovy40/src/org/apache/groovy/parser/antlr4/AstBuilder.java

@@ -4274,15 +4274,10 @@ public Parameter[] visitStandardLambdaParameters(final StandardLambdaParametersC
 
     @Override
     public Statement visitLambdaBody(final LambdaBodyContext ctx) {
-        if (asBoolean(ctx.expression())) {
-            return configureAST(new ExpressionStatement((Expression) this.visit(ctx.expression())), ctx);
-        }
-
         if (asBoolean(ctx.block())) {
             return configureAST(this.visitBlock(ctx.block()), ctx);
         }
-
-        throw createParsingFailedException("Unsupported lambda body: " + ctx.getText(), ctx);
+        return configureAST((Statement) this.visit(ctx.statementExpression()), ctx);
     }
 
     @Override

base/org.codehaus.groovy40/src/org/apache/groovy/parser/antlr4/GroovyParser.interp

@@ -4622,8 +4622,8 @@ public static class LambdaBodyContext extends GroovyParserRuleContext {
 		public BlockContext block() {
 			return getRuleContext(BlockContext.class,0);
 		}
-		public ExpressionContext expression() {
-			return getRuleContext(ExpressionContext.class,0);
+		public StatementExpressionContext statementExpression() {
+			return getRuleContext(StatementExpressionContext.class,0);
 		}
 		public LambdaBodyContext(ParserRuleContext parent, int invokingState) {
 			super(parent, invokingState);
@@ -4656,7 +4656,7 @@ public final LambdaBodyContext lambdaBody() throws RecognitionException {
 				enterOuterAlt(_localctx, 2);
 				{
 				setState(869);
-				expression(0);
+				statementExpression();
 				}
 				break;
 			}
@@ -13420,7 +13420,7 @@ private boolean pathExpression_sempred(PathExpressionContext _localctx, int pred
 		"\5\u0146\u00a4\2\u035e\u035f\5\u0082B\2\u035f}\3\2\2\2\u0360\u0361\5^"+
 		"\60\2\u0361\177\3\2\2\2\u0362\u0365\5^\60\2\u0363\u0365\5@!\2\u0364\u0362"+
 		"\3\2\2\2\u0364\u0363\3\2\2\2\u0365\u0081\3\2\2\2\u0366\u0369\5\u009eP"+
-		"\2\u0367\u0369\5\u00f0y\2\u0368\u0366\3\2\2\2\u0368\u0367\3\2\2\2\u0369"+
+		"\2\u0367\u0369\5\u00e6t\2\u0368\u0366\3\2\2\2\u0368\u0367\3\2\2\2\u0369"+
 		"\u0083\3\2\2\2\u036a\u0373\7Y\2\2\u036b\u036f\5\u0146\u00a4\2\u036c\u036d"+
 		"\5`\61\2\u036d\u036e\5\u0146\u00a4\2\u036e\u0370\3\2\2\2\u036f\u036c\3"+
 		"\2\2\2\u036f\u0370\3\2\2\2\u0370\u0371\3\2\2\2\u0371\u0372\7T\2\2\u0372"+