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* pmacros.scm (pmacros-init!): New arg rtl-version, all callers
updated. Use %-prefix if rtl-version >= 0.9.
* read.scm (/supported-rtl-versions): Add (0 9).
(/rtl-version-valid?): New function.
(/cmd-define-rtl-version): If new rtl version, reinvoke pmacros-init!.
(/reader-expr): New function.
(reader-process): New function.
(/reader-process-with-loc!): Renamed from /reader-process!.
Don't pre-expand `if' commands.
(/cmd-if): Simplify. Pmacro-expand test, then, else clauses here.
Handle rtl-version-equal?, rtl-version-at-least?.
* testsuite/Makefile.am (clean-test-files): Remove *.test.cpu*.
* testsuite/Makefile.in: Regenerate.
* testsuite/pmacros-1.test: Test both . and % as prefixes.
* testsuite/testsuite.cpu (/begin, /print, /dump): New pmacros.
(newline, print-match, print-expr, print-thunk): Use them.
(internal-verify): Update definition.
* doc/rtl.texi (define-rtl-version): Document rtl version 0.9.
(Top level conditionals): New node.