clang-query> match ifStmt(hasCondition(binaryOperator(hasRHS(integerLiteral(equals(0)))))

1:2: Error parsing argument 1 for matcher ifStmt.
1:9: Error parsing argument 1 for matcher hasCondition.
1:22: Error parsing argument 1 for matcher binaryOperator.
1:37: Error parsing argument 1 for matcher hasRHS.
1:44: Error parsing argument 1 for matcher integerLiteral.
1:59: Matcher not found: equals

Matcher<IntegerLiteral> equals  const ValueT Value

Matches literals that are equal to the given value of type ValueT.

Given
  f('false, 3.14, 42);
characterLiteral(equals(0))
  matches 'cxxBoolLiteral(equals(false)) and cxxBoolLiteral(equals(0))
  match false
floatLiteral(equals(3.14)) and floatLiteral(equals(314e-2))
  match 3.14
integerLiteral(equals(42))
  matches 42

Note that you cannot directly match a negative numeric literal because the
minus sign is not part of the literal: It is a unary operator whose operand
is the positive numeric literal. Instead, you must use a unaryOperator()
matcher to match the minus sign:

unaryOperator(hasOperatorName("-"),
              hasUnaryOperand(integerLiteral(equals(13))))

Usable as: Matcher<CharacterLiteral>, Matcher<CXXBoolLiteralExpr>,
           Matcher<FloatingLiteral>, Matcher<IntegerLiteral>