[vala/0.54] vala: Check for unavailable value-type of variable initializer

[Rico Tzschichholz <ricotz src gnome org>]

commit 5d620a50aff168974bae1f9fd41ef9c5d49237a4
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed Nov 17 18:46:22 2021 +0100

    vala: Check for unavailable value-type of variable initializer
    
    Regression of 6690ea0e3c6f0d81d849e13548efc8c0809149cc
    
    Fixes https://gitlab.gnome.org/GNOME/vala/issues/1253

 tests/Makefile.am                            | 2 ++
 tests/semantic/assignment-invalid-type.test  | 7 +++++++
 tests/semantic/initializer-invalid-type.test | 5 +++++
 vala/valaassignment.vala                     | 4 ++++
 vala/valalocalvariable.vala                  | 4 ++++
 5 files changed, 22 insertions(+)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 888f79e7a..515813465 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -973,6 +973,7 @@ TESTS = \
        semantic/assignment-same-variable.vala \
        semantic/assignment-signal-incompatible-method.test \
        semantic/assignment-signal-incompatible-type.test \
+       semantic/assignment-invalid-type.test \
        semantic/cast-gvalue-unsupported.test \
        semantic/cast-gvariant-unsupported.test \
        semantic/cast-void-not-allowed.vala \
@@ -1064,6 +1065,7 @@ TESTS = \
        semantic/foreach-next-value-void.test \
        semantic/foreach-next-void.test \
        semantic/foreach-wrong-types.test \
+       semantic/initializer-invalid-type.test \
        semantic/initializer-unknown-type.test \
        semantic/interface-prerequisite-invalid.test \
        semantic/interface-prerequisite-less-accessible.test \
diff --git a/tests/semantic/assignment-invalid-type.test b/tests/semantic/assignment-invalid-type.test
new file mode 100644
index 000000000..261c52ed0
--- /dev/null
+++ b/tests/semantic/assignment-invalid-type.test
@@ -0,0 +1,7 @@
+Invalid Code
+
+string bar;
+
+void main () {
+       bar = string;
+}
diff --git a/tests/semantic/initializer-invalid-type.test b/tests/semantic/initializer-invalid-type.test
new file mode 100644
index 000000000..2f8e91eaf
--- /dev/null
+++ b/tests/semantic/initializer-invalid-type.test
@@ -0,0 +1,5 @@
+Invalid Code
+
+void main () {
+       string foo = string;
+}
diff --git a/vala/valaassignment.vala b/vala/valaassignment.vala
index 46f9445a4..137361b28 100644
--- a/vala/valaassignment.vala
+++ b/vala/valaassignment.vala
@@ -297,6 +297,10 @@ public class Vala.Assignment : Expression {
                                        Report.error (source_reference, "Assignment: Invalid assignment 
attempt");
                                        return false;
                                }
+                       } else if (ma.symbol_reference is Variable && right.value_type == null) {
+                               error = true;
+                               Report.error (source_reference, "Assignment: Invalid assignment attempt");
+                               return false;
                        } else if (ma.symbol_reference is Variable) {
                                unowned Variable variable = (Variable) ma.symbol_reference;
                                unowned ArrayType? variable_array_type = variable.variable_type as ArrayType;
diff --git a/vala/valalocalvariable.vala b/vala/valalocalvariable.vala
index e6d15cf19..024b046fe 100644
--- a/vala/valalocalvariable.vala
+++ b/vala/valalocalvariable.vala
@@ -209,6 +209,10 @@ public class Vala.LocalVariable : Variable {
                                        Report.error (source_reference, "expression type not allowed as 
initializer");
                                        return false;
                                }
+                       } else if (initializer.value_type == null) {
+                               error = true;
+                               Report.error (source_reference, "expression type not allowed as initializer");
+                               return false;
                        }
 
                        if (!initializer.value_type.compatible (variable_type)) {