#321 Need better switch expansion

Need_by_1.0
open
3
2006-11-30
2006-11-30
No

The current switch expansion uses deprecated string+, and doesn't report why earlier matches failed. Instead, Kevin Reid suggests we expand as follows:

{ escape e1 { ... } catch p1 { escape e2 { ... } catch p2 { finalFail(specimen, p1, p2) }}}

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