From 34409b10f9ed1dd9cbdc110f8297a8efc34613f3 Mon Sep 17 00:00:00 2001
From: Rico Tzschichholz <ricotz@ubuntu.com>
Date: Tue, 26 Nov 2019 11:06:45 +0100
Subject: codegen: Fix precondition in creation method of structs

---
 codegen/valaccodemethodmodule.vala   | 15 ++++++++++-----
 tests/methods/prepostconditions.vala | 27 +++++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/codegen/valaccodemethodmodule.vala b/codegen/valaccodemethodmodule.vala
index 9eb868015..fe73655c2 100644
--- a/codegen/valaccodemethodmodule.vala
+++ b/codegen/valaccodemethodmodule.vala
@@ -1120,7 +1120,7 @@ public abstract class Vala.CCodeMethodModule : CCodeStructModule {
 		}
 	}
 
-	private void create_precondition_statement (CodeNode method_node, DataType ret_type, Expression precondition) {
+	private void create_precondition_statement (Method m, DataType ret_type, Expression precondition) {
 		var ccheck = new CCodeFunctionCall ();
 
 		precondition.emit (this);
@@ -1131,10 +1131,15 @@ public abstract class Vala.CCodeMethodModule : CCodeStructModule {
 		ccheck.add_argument (new CCodeConstant ("\"%s\"".printf (message.replace ("\n", " ").escape (""))));
 		requires_assert = true;
 
-		if (method_node is CreationMethod) {
-			ccheck.call = new CCodeIdentifier ("_vala_return_val_if_fail");
-			ccheck.add_argument (new CCodeConstant ("NULL"));
-		} else if (method_node is Method && ((Method) method_node).coroutine) {
+		if (m is CreationMethod) {
+			if (m.parent_symbol is Class) {
+				ccheck.call = new CCodeIdentifier ("_vala_return_val_if_fail");
+				ccheck.add_argument (new CCodeConstant ("NULL"));
+			} else {
+				// creation method of struct
+				ccheck.call = new CCodeIdentifier ("_vala_return_if_fail");
+			}
+		} else if (m.coroutine) {
 			// _co function
 			ccheck.call = new CCodeIdentifier ("_vala_return_val_if_fail");
 			ccheck.add_argument (new CCodeConstant ("FALSE"));
diff --git a/tests/methods/prepostconditions.vala b/tests/methods/prepostconditions.vala
index d7474df75..d8cd4d3f0 100644
--- a/tests/methods/prepostconditions.vala
+++ b/tests/methods/prepostconditions.vala
@@ -61,6 +61,24 @@ class Foo {
 	}
 }
 
+struct Bar {
+	public bool ensured;
+	public bool required;
+
+	public Bar () requires (required = true) {
+	}
+
+	public Bar.post () ensures (ensured = true) {
+	}
+
+	public void bar () ensures (ensured = true) {
+	}
+
+	public string foo () ensures (result.length >= 3) {
+		return "foo";
+	}
+}
+
 void main () {
 	var foo = new Foo();
 	assert(foo.required);
@@ -76,4 +94,13 @@ void main () {
 
 	var foo2 = new Foo.post ();
 	assert (foo2.ensured);
+
+	var bar = new Bar ();
+	assert (bar.required);
+	bar.bar ();
+	assert (bar.ensured);
+	assert (bar.foo () == "foo");
+
+	var bar2 = new Bar.post ();
+	assert (bar2.ensured);
 }
-- 
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