Do not put parens for single argument with end of line comment (#1518)

Fixes #1517

src/printer.js

@@ -2763,7 +2763,7 @@ function canPrintParamsWithoutParens(node) {
     !node.rest &&
     node.params[0].type === "Identifier" &&
     !node.params[0].typeAnnotation &&
-    !node.params[0].comments &&
+    !hasBlockComments(node.params[0]) &&
     !node.params[0].optional &&
     !node.predicate &&
     !node.returnType
@@ -4089,6 +4089,13 @@ function hasDanglingComments(node) {
     node.comments.some(comment => !comment.leading && !comment.trailing);
 }
 
+function hasBlockComments(node) {
+  return node.comments &&
+    node.comments.some(comment =>
+      comment.type === "Block" || comment.type === "CommentBlock"
+    );
+}
+
 function removeLines(doc) {
   // Force this doc into flat mode by statically converting all
   // lines into spaces (or soft lines into nothing). Hard lines

tests/comments/__snapshots__/jsfmt.spec.js.snap

@@ -235,11 +235,15 @@ function a(/* comment */) {} // comment
 function b() {} // comment
 function c(/* comment */ argA, argB, argC) {} // comment
 call((/*object*/ row) => {});
+KEYPAD_NUMBERS.map(num => ( // Buttons 0-9
+  <div />
+));
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 function a(/* comment */) {} // comment
 function b() {} // comment
 function c(/* comment */ argA, argB, argC) {} // comment
 call((/*object*/ row) => {});
+KEYPAD_NUMBERS.map(num => <div />); // Buttons 0-9
 
 `;
 

tests/comments/function-declaration.js

@@ -2,3 +2,6 @@ function a(/* comment */) {} // comment
 function b() {} // comment
 function c(/* comment */ argA, argB, argC) {} // comment
 call((/*object*/ row) => {});
+KEYPAD_NUMBERS.map(num => ( // Buttons 0-9
+  <div />
+));