2823bebd23
This allows efficient recovery from a parse error as well as implementing `has_to_string` for `message`
19 lines
791 B
Text
19 lines
791 B
Text
import init.lean.name_mangling init.lean.parser.identifier
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open lean lean.parser
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open tactic
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meta def check (s : string) : tactic unit :=
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match id.run $ parsec.parse (identifier : parsec' _) s with
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| except.ok n :=
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trace (name.mangle n) >>
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if name.demangle (name.mangle n) = some n then exact `(true)
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else trace ("mangling failed at " ++ s) >> exact `(false)
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| except.error ex := trace ex >> exact `(false)
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example : by check "_αβ" := trivial
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example : by check "αβ" := trivial
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example : by check "nat.add" := trivial
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example : by check "test.bla.foo" := trivial
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example : by check "t21'αβ._₁._12" := trivial
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example : by check "nat" := trivial
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example : by check "nat.equations._eqn1" := trivial
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