model: accept multiple vararg parameters

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/src/model/model.nit b/src/model/model.nit
index ccb7522..49ababd 100644 (file)
--- a/src/model/model.nit
+++ b/src/model/model.nit
@@ -1818,16 +1818,26 @@ class MSignature
                for i in [0..mparameters.length[ do
                        var parameter = mparameters[i]
                        if parameter.is_vararg then
-                               assert vararg_rank == -1
+                               if vararg_rank >= 0 then
+                                       # If there is more than one vararg,
+                                       # consider that additional arguments cannot be mapped.
+                                       vararg_rank = -1
+                                       break
+                               end
                                vararg_rank = i
                        end
                end
                self.vararg_rank = vararg_rank
        end
 
-       # The rank of the ellipsis (`...`) for vararg (starting from 0).
+       # The rank of the main ellipsis (`...`) for vararg (starting from 0).
        # value is -1 if there is no vararg.
        # Example: for "(a: Int, b: Bool..., c: Char)" #-> vararg_rank=1
+       #
+       # From a model POV, a signature can contain more than one vararg parameter,
+       # the `vararg_rank` just indicates the one that will receive the additional arguments.
+       # However, currently, if there is more that one vararg parameter, no one will be the main one,
+       # and additional arguments will be refused.
        var vararg_rank: Int is noinit
 
        # The number of parameters