Idris2/tests/node/syntax001/caseBlock.idr

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Idris
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2020-07-14 19:38:47 +03:00
module Main
-- When generating javasript from idris, it is possible that the same name may appear in
-- different clauses when translating cases from Idris. To avoid a javascript syntax error
-- from occuring due to duplicate declations, each case clause is wrapped in brackets
-- to create unique block scopes.
-- https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/switch
-- Without wrapping in a block, the test error may look like the following:
-- syntax001/build/exec/_tmp_node.js:39
-- const x = ({h:1});
-- ^
-- SyntaxError: Identifier 'x' has already been declared
test : Bool -> Int
test x @ True =
case x of
_ => 0
test x @ False =
case x of
_ => 1
main : IO ()
main = do
printLn $ test True
printLn $ test False