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
IVariableBinding curr= (IVariableBinding) bindings[i];
				ITypeBinding type= curr.getType();
				if (type != null && TypeRules.canAssign(type, returnBinding) && testModifier(curr)) {
					if (result == null) {
						result= ast.newSimpleName(curr.getName());
					}
					addLinkedPositionProposal(RETURN_EXPRESSION_KEY, curr.getName(), null);
				}
			}
		}
		Expression defaultExpression= ASTNodeFactory.newDefaultExpression(ast, fMethodDecl.getReturnType2(), fMethodDecl.getExtraDimensions());
		addLinkedPositionProposal(RETURN_EXPRESSION_KEY, ASTNodes.asString(defaultExpression), null);
		if (result == null) {
			return defaultExpression;
		}
		return result;
	}
	private boolean testModifier(IVariableBinding curr) {
		int modifiers= curr.getModifiers();
		int staticFinal= Modifier.STATIC | Modifier.FINAL;
		if ((modifiers & staticFinal) == staticFinal) {
			return false;
		}
		if (Modifier.isStatic(modifiers) && !Modifier.isStatic(fMethodDecl.getModifiers())) {
			return false;
		}
		return true;
	}
}