Merge pull request #1314 from xushiwei/cmd

fix #1312

parser/_testdata/cmdlinestyle5/cmd5.gop

@@ -0,0 +1 @@
+println (1+2i)*2

parser/_testdata/cmdlinestyle5/parser.expect

@@ -0,0 +1,41 @@
+package main
+
+file cmd5.gop
+noEntrypoint
+ast.FuncDecl:
+  Name:
+    ast.Ident:
+      Name: main
+  Type:
+    ast.FuncType:
+      Params:
+        ast.FieldList:
+  Body:
+    ast.BlockStmt:
+      List:
+        ast.ExprStmt:
+          X:
+            ast.CallExpr:
+              Fun:
+                ast.Ident:
+                  Name: println
+              Args:
+                ast.BinaryExpr:
+                  X:
+                    ast.ParenExpr:
+                      X:
+                        ast.BinaryExpr:
+                          X:
+                            ast.BasicLit:
+                              Kind: INT
+                              Value: 1
+                          Op: +
+                          Y:
+                            ast.BasicLit:
+                              Kind: IMAG
+                              Value: 2i
+                  Op: *
+                  Y:
+                    ast.BasicLit:
+                      Kind: INT
+                      Value: 2

parser/parser.go

@@ -1896,7 +1896,8 @@ L:
 			if lhs {
 				p.resolve(x)
 			}
-			x = p.parseCallOrConversion(p.checkExprOrType(x), false)
+			isCmd := allowCmd && x.End() != p.pos // println ()
+			x = p.parseCallOrConversion(p.checkExprOrType(x), isCmd)
 		case token.LBRACE: // {
 			if allowCmd && x.End() != p.pos { // println {}
 				x = p.parseCallOrConversion(p.checkExprOrType(x), true)