Bug 82940 [quick fix] Missing sensible conversion suggestion
For this code > % cat Test.java import java.util.Collections; import java.util.List; public class Test { interface Wrapper { int doit(); } private static final List<Wrapper> STD_WRAPPERS = Collections.singletonList ((Wrapper)new Wrapper() { public int doit() { return 0; } }); private static final List<Wrapper> STD_WRAPPERS2 = Collections.singletonList (new Wrapper() { public int doit() { return 0; } }); } The value passed Collections.singletonList is actually of the right type so a sensible conversion would be to put in the cast (see the difference between the 2 statics). The current quick fixes offered assume the type being assigned to is wrong (when infact it is right). A useful quick fix would be to cast the parameter to the right type to give the left type (this would help with any 1 arg method of the form X<T> method(T)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/correction/MissingReturnTypeCorrectionProposal.java
if (lastStatement == null) {
				offset= block.getStartPosition() + 1;
			} else {
				offset= lastStatement.getStartPosition() + lastStatement.getLength();
			}
			ReturnStatement returnStatement= ast.newReturnStatement();
			Expression expression= evaluateReturnExpressions(ast, returnBinding, offset);
			returnStatement.setExpression(expression);
			rewrite.getListRewrite(block, Block.STATEMENTS_PROPERTY).insertLast(returnStatement, null);
			addLinkedPosition(rewrite.track(returnStatement.getExpression()), true, RETURN_EXPRESSION_KEY);
			return rewrite;
		}
	}
	private ITypeBinding getReturnTypeBinding() {
		IMethodBinding methodBinding= fMethodDecl.resolveBinding();
		if (methodBinding != null && methodBinding.getReturnType() != null) {
			return methodBinding.getReturnType();
		}
		return null;
	}
	/*
	 * Evaluates possible return expressions. The favourite expression is returned.
	 */
	private Expression evaluateReturnExpressions(AST ast, ITypeBinding returnBinding, int returnOffset) {
		CompilationUnit root= (CompilationUnit) fMethodDecl.getRoot();
		Expression result= null;
		if (returnBinding != null) {
			ScopeAnalyzer analyzer= new ScopeAnalyzer(root);
			IBinding[] bindings= analyzer.getDeclarationsInScope(returnOffset, ScopeAnalyzer.VARIABLES | ScopeAnalyzer.CHECK_VISIBILITY );
			for (int i= 0; i < bindings.length; i++) {