Pattern Parse Error: f[x:(_..)]

rljacobson / FoxySheep

Compiler Technologies for Mathematica/Wolfram Language.

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Pattern Parse Error: f[x:(_..)] #2

Open rocky opened 4 years ago

rocky commented 4 years ago

From https://github.com/mathics/Mathics/issues/668

foxy-sheep -e 'f[x:(_..)]'
line 1:8 no viable alternative at input 'f[x:(_..)'

rljacobson commented 3 years ago

Is this a version of the ambiguity between x_. and x_..? Mathematica (the software) treats the expression x_.. inconsistently between the Notebook and command line interfaces. See here.

I consider it a bug, though. Like #3, it is one of the many edge cases involving .