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+Forth in Rust.
+
+FRUSTRATION has got a foot standing on its own tail because writing a
+monolithic outer interpreter in a high level language makes it really
+annoying to monkey with the functioning of the interpreter from within
+the language it's interpreting.  PARSE/WORD and the input stream
+handling was the first place this became obvious.  This design is a
+dead end.  The path forward would be stripping it back to primitives
+and rewriting the outer interpreter in Forth.