hasDef *sparseSet   // has a write of the variable we're processing

	// miscellaneous
	placeholder *ssa.Value // value to use as a "not set yet" placeholder.
}

func (s *phiState) insertPhis() {
	if debugPhi {
		fmt.Println(s.f.String())
	}

	// Find all the variables for which we need to match up reads & writes.
	// This step prunes any basic-block-only variables from consideration.

   *
   * @param formal The type whose type variables or itself is mapped to other type(s). It's almost
   *     always a bug if {@code formal} isn't a type variable and contains no type variable. Make
   *     sure you are passing the two parameters in the right order.
   * @param actual The type that the formal type variable(s) are mapped to. It can be or contain yet

  // Reads and returns a checkpoint key associated with a variable.
  //
  // The variable is identified by the index in the object graph node list.
  //
  // RestoreV2 is the operation that will ultimately be responsible for reading
  // and restoring the variable(s)' values.  Variable values are indexed in the
  // checkpoint files by "checkpoint keys".  These keys along with dtype and

		},
		{
			name: "single boolean variable in expression",
			variables: []NamedExpressionAccessor{
				&testVariable{
					name:       "fortuneTelling",
					expression: "true",
				},
			},
			attributes:     endpointCreateAttributes(),
			expression:     "variables.fortuneTelling",
			expectedResult: true,
		},
		{
			name: "variable of a list",
			variables: []NamedExpressionAccessor{
				&testVariable{

      // Handles resource variables.
      TF_RET_CHECK(input->dtype() == DT_RESOURCE);
      const VariableInfo& variable = *variable_info_lookup[input_num];
      arg.name = std::string(variable.name());
      arg.kind = XlaCompiler::Argument::kResource;
      arg.resource_kind = XlaResource::kVariable;
      arg.definition_stack_trace = variable.definition_stack_trace();

   *
   * @param formal The type whose type variables or itself is mapped to other type(s). It's almost
   *     always a bug if {@code formal} isn't a type variable and contains no type variable. Make
   *     sure you are passing the two parameters in the right order.
   * @param actual The type that the formal type variable(s) are mapped to. It can be or contain yet

}

// ExpandEnv replaces ${var} or $var in the string according to the values
// of the current environment variables. References to undefined
// variables are replaced by the empty string.
func ExpandEnv(s string) string {
	return Expand(s, Getenv)
}

// isShellSpecialVar reports whether the character identifies a special
// shell variable such as $*.
func isShellSpecialVar(c uint8) bool {
	switch c {

Execute.

Variables

A pipeline inside an action may initialize a variable to capture the result.
The initialization has syntax

	$variable := pipeline

where $variable is the name of the variable. An action that declares a
variable produces no output.

Variables previously declared can also be assigned, using the syntax

	$variable = pipeline

        for i, j /* ERRORx `range over .* permits only one iteration variable` */ = range s {}
        for i, j, k /* ERRORx `range over .* permits only one iteration variable|at most 2 expressions` */ = range s {}
        for i, j, k, l /* ERRORx `range over .* permits only one iteration variable|at most 2 expressions` */ = range s {}

    ProcessForkOptions workingDir(Object dir);

    /**
     * The environment variables to use for the process. Defaults to the environment of this process.
     *
     * @return The environment. Returns an empty map when there are no environment variables.
     */
    Map<String, Object> getEnvironment();

    /**
     * Sets the environment variable to use for the process.
     *