d724aa7069
read-char read the char name with symbol-char?, so a literal whose char isn't a
symbol char (\{, \(, \), \,, \%, …) came back as an empty name and errored
'Unsupported character'. Now a single non-symbol char after \ is taken as a
one-character literal of that char. Surfaced by funcool/cuerdas (uses \{), which
now loads. Spec cases added.
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