message: Highlight & in math modes
  We use the scope keyword.control.equation.align.latex. It will most
  likely be highlighted as in tabulars/arrays.
diff: <string>meta.function.environment.math.latex</string>
  <key>patterns</key>
  <array>
  + <dict>
  + <key>match</key>
  + <string>(?<!\\)&amp;</string>
  + <key>name</key>
  + <string>keyword.control.equation.align.latex</string>
  + </dict>
  <dict>
  <key>include</key>
  <string>text.tex#math</string>
  