checkInitializers_(variables) {
    if (this.options_.blockBinding &&
        variables.declarationType === CONST) {
      let type = variables.declarationType;
      for (let i = 0; i < variables.declarations.length; i++) {
        if (!this.checkInitializer_(type, variables.declarations[i])) {
          break;
        }
      }
    }
  }
Checks variable declaration in variable and for statements.

@param {VariableDeclarationList} variables
@return {void}
@private