Add lambda expressions

Author: Sainan

Pluto.tmbundle/Syntaxes/Pluto.tmLanguage

@@ -170,6 +170,48 @@
 					<key>name</key>
 					<string>meta.function.incomplete.pluto</string>
 				</dict>
+				<dict>
+					<key>begin</key>
+					<string>\|(?=[a-zA-Z0-9_,\s]*\|\s*-&gt;)</string>
+					<key>beginCaptures</key>
+					<dict>
+						<key>0</key>
+						<dict>
+							<key>name</key>
+							<string>punctuation.section.group.begin.pluto</string>
+						</dict>
+					</dict>
+					<key>end</key>
+					<string>(\|)\s*(-&gt;)</string>
+					<key>endCaptures</key>
+					<dict>
+						<key>1</key>
+						<dict>
+							<key>name</key>
+							<string>punctuation.section.group.end.pluto</string>
+						</dict>
+						<key>2</key>
+						<dict>
+							<key>name</key>
+							<string>storage.type.function.arrow.pluto</string>
+						</dict>
+					</dict>
+					<key>patterns</key>
+					<array>
+						<dict>
+							<key>match</key>
+							<string>[a-zA-Z_][a-zA-Z0-9_]*</string>
+							<key>name</key>
+							<string>variable.parameter.function.pluto</string>
+						</dict>
+						<dict>
+							<key>match</key>
+							<string>,</string>
+							<key>name</key>
+							<string>punctuation.separator.comma.pluto</string>
+						</dict>
+					</array>
+				</dict>
 				<dict>
 					<key>include</key>
 					<string>#simpleexp</string>