From 64fca5db2081ae208e9bf262bbfe72c60941c862 Mon Sep 17 00:00:00 2001
From: Nathan Sobo <nathan@github.com>
Date: Sat, 20 Jun 2015 17:36:12 +0200
Subject: [PATCH] Absorb exception in isFoldableCodeAtRow and report assertion
 failure
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Can’t figure out what’s going on in this bug, but we can hopefully make
it less damaging and collect more information via the new assertion
system.

Refs #5905
---
 src/tokenized-buffer.coffee | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/tokenized-buffer.coffee b/src/tokenized-buffer.coffee
index 7fb21937d..bbb6b3748 100644
--- a/src/tokenized-buffer.coffee
+++ b/src/tokenized-buffer.coffee
@@ -292,7 +292,17 @@ class TokenizedBuffer extends Model
   # Returns a {Boolean} indicating whether the given buffer row starts
   # a a foldable row range due to the code's indentation patterns.
   isFoldableCodeAtRow: (row) ->
-    return false if @buffer.isRowBlank(row) or @tokenizedLineForRow(row).isComment()
+    # Investigating an exception that's occurring here due to the line being
+    # undefined. This should paper over the problem but we want to figure out
+    # what is happening:
+    tokenizedLine = @tokenizedLineForRow(row)
+    atom.assert tokenizedLine?, "TokenizedLine is defined", =>
+      metadata:
+        row: row
+        rowCount: @tokenizedLines.length
+    return false unless tokenizedLine?
+
+    return false if @buffer.isRowBlank(row) or tokenizedLine.isComment()
     nextRow = @buffer.nextNonBlankRow(row)
     return false unless nextRow?