deconflict `tmp` within its fragment

src/generators/dom/index.js

@@ -78,7 +78,7 @@ class DomGenerator extends Generator {
 		} else {
 			properties.addBlock( deindent`
 				update: function ( changed, ${fragment.params.join( ', ' )} ) {
-					var ${this.alias( 'tmp' )};
+					${fragment.tmp ? `var ${fragment.tmp};` : ''}
 
 					${fragment.builders.update}
 				},

src/generators/dom/visitors/MustacheTag.js

@@ -9,9 +9,12 @@ export default {
 		generator.current.builders.init.addLine( `var last_${name} = ${snippet};` );
 		generator.addElement( name, `${generator.helper( 'createText' )}( last_${name} )`, true );
 
+		if ( !generator.current.tmp ) {
+			generator.current.tmp = generator.current.getUniqueName( 'tmp' );
+		}
 		generator.current.builders.update.addBlock( deindent`
-			if ( ( ${generator.alias( 'tmp' )} = ${snippet} ) !== last_${name} ) {
+			if ( ( ${generator.current.tmp} = ${snippet} ) !== last_${name} ) {
-				${name}.data = last_${name} = ${generator.alias( 'tmp' )};
+				${name}.data = last_${name} = ${generator.current.tmp};
 			}
 		` );
 	}

src/generators/dom/visitors/RawMustacheTag.js

@@ -26,9 +26,12 @@ export default {
 			generator.current.builders.init.addLine( mountStatement );
 		}
 
+		if ( !generator.current.tmp ) {
+			generator.current.tmp = generator.current.getUniqueName( 'tmp' );
+		}
 		generator.current.builders.update.addBlock( deindent`
-			if ( ( ${generator.alias( 'tmp' )} = ${snippet} ) !== last_${name} ) {
+			if ( ( ${generator.current.tmp} = ${snippet} ) !== last_${name} ) {
-				last_${name} = ${generator.alias( 'tmp' )};
+				last_${name} = ${generator.current.tmp};
 				${detachStatement}
 				${mountStatement}
 			}

src/generators/dom/visitors/attributes/addElementAttributes.js

@@ -105,9 +105,12 @@ export default function addElementAttributes ( generator, node, local ) {
 					}
 
 					local.init.addLine( updater );
+					if ( !generator.current.tmp ) {
+						generator.current.tmp = generator.current.getUniqueName( 'tmp' );
+					}
 					local.update.addBlock( deindent`
-						if ( ( ${generator.alias( 'tmp' )} = ${snippet} ) !== ${last} ) {
+						if ( ( ${generator.current.tmp} = ${snippet} ) !== ${last} ) {
-							${last} = ${generator.alias( 'tmp' )};
+							${last} = ${generator.current.tmp};
 							${updater}
 						}
 					` );