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# core.internal.dassert

string `_d_assert_fail`(A)(scope const string `op`, auto ref scope const A `a`);
  Generates rich assert error messages for unary expressions
  The unary expression assert(!una) will be turned into assert(!una, `_d_assert_fail`("!", una)). This routine simply acts as if the user wrote assert(una == false).
  Parameters:

  string `op` | Operator that was used in the expression, currently only "!" is supported.
  A `a` | Result of the expression that was used in assert before its implicit conversion to bool.

  Returns:
  A string such as "a != true" or "a == true".
template `_d_assert_fail`(A...)
  Generates rich assert error messages for binary expressions
  The binary expression assert(x == y) will be turned into assert(x == y, `_d_assert_fail`!(typeof(x))("==", x, y)).
  Parameters:

  string comp | Comparison operator that was used in the expression.
  A a | Left hand side operand (can be a tuple).
  B b | Right hand side operand (can be a tuple).

  Returns:
  A string such as "$a $comp $b".

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