From 468b532885006bcd15455bc19dad7530e5ac6f53 Mon Sep 17 00:00:00 2001
From: Matthew Dean <matthew-dean@users.noreply.github.com>
Date: Sat, 16 Jun 2018 11:59:18 -0700
Subject: [PATCH] Fixes #3195 (#3215)

---
 lib/less/tree/ruleset.js          | 34 +++++++++++++++++--------------
 test/less/extract-and-length.less | 13 ++++++++++++
 2 files changed, 32 insertions(+), 15 deletions(-)

diff --git a/lib/less/tree/ruleset.js b/lib/less/tree/ruleset.js
index c57facc1..93321dcd 100644
--- a/lib/less/tree/ruleset.js
+++ b/lib/less/tree/ruleset.js
@@ -349,21 +349,25 @@ Ruleset.prototype.parseValue = function(toParse) {
     var self = this;
     function transformDeclaration(decl) {
         if (decl.value instanceof Anonymous && !decl.parsed) {
-            this.parse.parseNode(
-                decl.value.value, 
-                ["value", "important"], 
-                decl.value.getIndex(), 
-                decl.fileInfo(), 
-                function(err, result) {
-                    if (err) {
-                        decl.parsed = true;
-                    }
-                    if (result) {
-                        decl.value = result[0];
-                        decl.important = result[1] || '';
-                        decl.parsed = true;
-                    }
-                });
+            if (typeof decl.value.value === "string") {
+                this.parse.parseNode(
+                    decl.value.value,
+                    ["value", "important"], 
+                    decl.value.getIndex(), 
+                    decl.fileInfo(), 
+                    function(err, result) {
+                        if (err) {
+                            decl.parsed = true;
+                        }
+                        if (result) {
+                            decl.value = result[0];
+                            decl.important = result[1] || '';
+                            decl.parsed = true;
+                        }
+                    });
+            } else {
+                decl.parsed = true;
+            }
 
             return decl;
         }
diff --git a/test/less/extract-and-length.less b/test/less/extract-and-length.less
index 8b1901c8..d064bdb9 100644
--- a/test/less/extract-and-length.less
+++ b/test/less/extract-and-length.less
@@ -1,4 +1,17 @@
 
+// test late parsing
+@cols: 1, 2;
+
+.a(@i: length(@cols)) when (@i > 0) {
+  @divider: e(extract(@cols, @i));
+}
+.a;
+
+.b(@j: 1) when (@j < length(@cols)) {
+  @divider: e(extract(@cols, @j));
+}
+.b;
+
 // simple array/list:
 
 .multiunit {