From: Alexis Laferrière Date: Thu, 15 Feb 2018 16:18:45 +0000 (-0500) Subject: model: infer the types of attributes with unary - and once X-Git-Url: http://nitlanguage.org model: infer the types of attributes with unary - and once Signed-off-by: Alexis Laferrière --- diff --git a/src/modelize/modelize_property.nit b/src/modelize/modelize_property.nit index 4db4790..2ae2b59 100644 --- a/src/modelize/modelize_property.nit +++ b/src/modelize/modelize_property.nit @@ -1510,6 +1510,14 @@ redef class AAttrPropdef end mtype = mmodule.array_type(item_mtypes.first) + else if nexpr isa AUminusExpr and (nexpr.n_expr isa AIntegerExpr or nexpr.n_expr isa AFloatExpr) then + # The Int and Float unary - is defined in `kernel`, so this may + # result in an invalid behavior when using a custom kernel. + # A workaround is to declare the attribute static type. + # This is still very useful, especially to novice programmers. + mtype = infer_static_type(modelbuilder, nexpr.n_expr, mclassdef, mmodule, mreadpropdef) + else if nexpr isa AOnceExpr then + mtype = infer_static_type(modelbuilder, nexpr.n_expr, mclassdef, mmodule, mreadpropdef) else modelbuilder.error(self, "Error: untyped attribute `{mreadpropdef}`. Implicit typing allowed only for literals and new.") end