[vala/0.40] vala: Add some missing type copying

[Rico Tzschichholz <ricotz src gnome org>]

commit c6444e7cd498b587fb7ede526605c83451aef5b2
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue Oct 23 15:05:30 2018 +0200

    vala: Add some missing type copying

 vala/valaassignment.vala      | 8 ++++----
 vala/valareturnstatement.vala | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/vala/valaassignment.vala b/vala/valaassignment.vala
index 2f95a71f1..4768f963d 100644
--- a/vala/valaassignment.vala
+++ b/vala/valaassignment.vala
@@ -210,10 +210,10 @@ public class Vala.Assignment : Expression {
                                parent_node.replace_expression (this, set_call);
                                return set_call.check (context);
                        } else {
-                               right.target_type = left.value_type;
+                               right.target_type = left.value_type.copy ();
                        }
                } else if (left is PointerIndirection) {
-                       right.target_type = left.value_type;
+                       right.target_type = left.value_type.copy ();
                } else {
                        error = true;
                        Report.error (source_reference, "unsupported lvalue in assignment");
@@ -237,7 +237,7 @@ public class Vala.Assignment : Expression {
                                var old_value = new MemberAccess (ma.inner, ma.member_name);
 
                                var bin = new BinaryExpression (BinaryOperator.PLUS, old_value, right, 
source_reference);
-                               bin.target_type = right.target_type;
+                               bin.target_type = right.target_type.copy ();
                                right.target_type = right.target_type.copy ();
                                right.target_type.value_owned = false;
 
@@ -341,7 +341,7 @@ public class Vala.Assignment : Expression {
                                                return false;
                                        }
 
-                                       right.value_type = variable.variable_type;
+                                       right.value_type = variable.variable_type.copy ();
                                } else {
                                        error = true;
                                        Report.error (source_reference, "Assignment: Invalid assignment 
attempt");
diff --git a/vala/valareturnstatement.vala b/vala/valareturnstatement.vala
index e407aec4a..320764843 100644
--- a/vala/valareturnstatement.vala
+++ b/vala/valareturnstatement.vala
@@ -78,7 +78,7 @@ public class Vala.ReturnStatement : CodeNode, Statement {
                checked = true;
 
                if (return_expression != null) {
-                       return_expression.target_type = context.analyzer.current_return_type;
+                       return_expression.target_type = context.analyzer.current_return_type.copy ();
                }
 
                if (return_expression != null && !return_expression.check (context)) {