PR19352: proposed patch

[Jerry DeLisle]

This is a first patch for me so would appreciate suggestions.

Propose changing the error type for recursive io calls to runtime_error
rather than internal_error.  Change the error message to be clearer to
understand.  Fixes a typo in a comment.

I picked something simple since I am very new at this.  I was not sure 
what to do for a test case.  But I tested it with the sample program in 
the PR.

Let me know what you think and if OK can someone commit.

Bootstrapped and tested.

Attached diff

Jerry

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