Your right. Seems I missed a level of identation (easily done in that source). I also missed another, rather more obvious clue: 

# toke.c:3207 (5.8.5)
        /* This hack serves to disambiguate a pair of curlies
         * as being a block or an anon hash.  Normally, expectation
         * determines that, but in cases where we're not in a
         * position to expect anything in particular (like inside
         * eval"") we have to resolve the ambiguity.  This code
         * covers the case where the first term in the curlies is a
         * quoted string.  Most other cases need to be explicitly
         * disambiguated by prepending a `+' before the opening
         * curly in order to force resolution as an anon hash.
         *
         * XXX should probably propagate the outer expectation
         * into eval"" to rely less on this hack, but that could
         * potentially break current behavior of eval"".
         * GSAR 97-07-21
         */

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In reply to Re^5: Mysterious "syntax error" by BrowserUk
in thread Mysterious "syntax error" by BrowserUk

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