fix corner cases with template literals (#4903)

fixes #4902

2 files changed, 36 insertions, 0 deletions

diff --git a/lib/output.js b/lib/output.js
index 6272264f..308fcf54 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -709,6 +709,8 @@ function OutputStream(options) {
         // (x++)[y]
         // (typeof x).y
         if (p instanceof AST_PropAccess) return p.expression === this;
+        // (~x)`foo`
+        if (p instanceof AST_Template) return p.tag === this;
     }
     PARENS(AST_Await, needs_parens_unary);
     PARENS(AST_Unary, needs_parens_unary);
@@ -782,6 +784,8 @@ function OutputStream(options) {
         if (p instanceof AST_Class) return true;
         // (foo && bar)["prop"], (foo && bar).prop
         if (p instanceof AST_PropAccess) return p.expression === this;
+        // (foo && bar)``
+        if (p instanceof AST_Template) return p.tag === this;
         // typeof (foo && bar)
         if (p instanceof AST_Unary) return true;
     });
diff --git a/test/compress/templates.js b/test/compress/templates.js
index e46f3c06..bac1f061 100644
--- a/test/compress/templates.js
+++ b/test/compress/templates.js
@@ -62,6 +62,23 @@ tag_parentheses_arrow: {
     node_version: ">=4"
 }
 
+tag_parentheses_binary: {
+    options = {
+        collapse_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var f = function() {
+            console.log("PASS");
+        } || console
+        f``;
+    }
+    expect_exact: '(function(){console.log("PASS")}||console)``;'
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
 tag_parentheses_new: {
     input: {
         (new function() {
@@ -87,6 +104,21 @@ tag_parentheses_sequence: {
     node_version: ">=4"
 }
 
+tag_parentheses_unary: {
+    input: {
+        var a;
+        try {
+            (~a)``;
+            (a++)``;
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect_exact: 'var a;try{(~a)``;(a++)``}catch(e){console.log("PASS")}'
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
 malformed_escape: {
     input: {
         (function(s) {