[vala/0.50] vala: Parameter following params-array parameter is not allowed

[Rico Tzschichholz <ricotz src gnome org>]

commit f4eec0df56a72df25e056743ff7ee4bec0ea4695
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed May 26 09:02:52 2021 +0200

    vala: Parameter following params-array parameter is not allowed
    
    Fixes https://gitlab.gnome.org/GNOME/vala/issues/1183

 tests/Makefile.am                         | 1 +
 tests/methods/params-array-preceding.test | 7 +++++++
 vala/valamethod.vala                      | 6 ++++++
 3 files changed, 14 insertions(+)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 0cf57444b..abf9372e9 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -228,6 +228,7 @@ TESTS = \
        methods/nowrapper-no-vfunc.test \
        methods/params-array.vala \
        methods/params-array-abstract.test \
+       methods/params-array-preceding.test \
        methods/params-array-with-throws.vala \
        methods/print-attribute.vala \
        methods/print-attribute-invalid.test \
diff --git a/tests/methods/params-array-preceding.test b/tests/methods/params-array-preceding.test
new file mode 100644
index 000000000..0e57bf188
--- /dev/null
+++ b/tests/methods/params-array-preceding.test
@@ -0,0 +1,7 @@
+Invalid Code
+
+void foo (params string[] strv, int i) {
+}
+
+void main () {
+}
diff --git a/vala/valamethod.vala b/vala/valamethod.vala
index 0bed502b9..9c34c7ad0 100644
--- a/vala/valamethod.vala
+++ b/vala/valamethod.vala
@@ -841,6 +841,7 @@ public class Vala.Method : Subroutine, Callable {
                }
 
                var optional_param = false;
+               var params_array_param = false;
                foreach (Parameter param in parameters) {
                        if (!param.check (context)) {
                                error = true;
@@ -865,6 +866,11 @@ public class Vala.Method : Subroutine, Callable {
                                optional_param = true;
                        }
 
+                       if (params_array_param) {
+                               Report.error (param.source_reference, "parameter follows params-array 
parameter");
+                       } else if (param.params_array) {
+                               params_array_param = true;
+                       }
                        // Add local variable to provide access to params arrays which will be constructed 
out of the given va-args
                        if (param.params_array && body != null) {
                                if (params_array_var != null) {