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March 6, 2017 18:42
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Elm 0.18 Pattern Matching compiler bug (uses Gigabytes of memory, 100% CPU and forever to compile)
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| module Bug exposing (..) | |
| {-| Uses tons of CPU, time to compile and Gigbytes of memory. It's exponetially worse the more cases there are. | |
| The gigabytes of memory happen when the first of the 3-tuple is the same. Change the tuples to have the x0, x1, etc as the first and the memory issue disappears but not the CPU or time to compile. | |
| Also starts to be a real problem 3-tuple and higher. | |
| -} | |
| bug : String | |
| bug = | |
| let | |
| x = | |
| ( "a", "a", "x" ) | |
| in | |
| case x of | |
| ( "x", "x0", "x" ) -> | |
| "" | |
| ( "x", "x1", "x" ) -> | |
| "" | |
| ( "x", "x2", "x" ) -> | |
| "" | |
| ( "x", "x3", "x" ) -> | |
| "" | |
| ( "x", "x4", "x" ) -> | |
| "" | |
| ( "x", "x5", "x" ) -> | |
| "" | |
| ( "x", "x6", "x" ) -> | |
| "" | |
| ( "x", "x7", "x" ) -> | |
| "" | |
| ( "x", "x8", "x" ) -> | |
| "" | |
| ( "x", "x9", "x" ) -> | |
| "" | |
| ( "x", "x10", "x" ) -> | |
| "" | |
| ( "x", "x11", "x" ) -> | |
| "" | |
| ( "x", "x12", "x" ) -> | |
| "" | |
| ( "x", "x13", "x" ) -> | |
| "" | |
| ( "x", "x14", "x" ) -> | |
| "" | |
| ( "x", "x15", "x" ) -> | |
| "" | |
| ( "x", "x16", "x" ) -> | |
| "" | |
| ( "x17", "x", "x" ) -> | |
| "" | |
| _ -> | |
| Debug.crash "You forgot something" |
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