LambdaExpressionsEquality.cs

// Here different expression keys should be generated since parameter "value" is different
// for two expressions at the moment of their creation
int value = 1;
Expression<Func<string, string>> expr1 = s => s.Length > value ? s.Substring(0, value) : s;

int value = 2;
Expression<Func<string, string>> expr2 = s => s.Length > value ? s.Substring(0, value) : s;

// Here same expression keys should be generated since parameter value (1) is the same
// for two expressions at the moment of their creation
int value = 1;
Expression<Func<string, string>> expr1 = s => s.Length > value ? s.Substring(0, value) : s;

Expression<Func<string, string>> expr2 = s => s.Length > 1 ? s.Substring(0, 1) : s;