Rename def to alias.

test/test_suite/methods/access.c3

@@ -10,7 +10,7 @@ struct An3
     An2 y;
 }
 
-def AnCall = fn void();
+alias AnCall = fn void();
 
 struct An2
 {

test/test_suite/methods/access_private_method.c3

@@ -1,4 +1,4 @@
-def NodeNotifyHandler = fn void(TreeView* this, TreeNode* node, String prop, void* data);
+alias NodeNotifyHandler = fn void(TreeView* this, TreeNode* node, String prop, void* data);
 fn void TreeView.nodeNotifyHandler(TreeView* this, TreeNode* node, String prop, void* data) @private {}
 
 struct TreeNode { int abc; NodeNotifyHandler notifyHandler; }

test/test_suite/methods/extension_method_check.c3

@@ -1,6 +1,6 @@
 module test;
 
-def Bob = Test{any};
+alias Bob = Test{any};
 fn void Bob.crash(&self) {}
 
 fn int main()

test/test_suite/methods/extension_method_generic.c3

@@ -1,7 +1,7 @@
 module compiler_c3;
 import std::collections::list;
 
-def IntArray = List{int};
+alias IntArray = List{int};
 
 extern fn void printf(char*, ...);
 

test/test_suite/methods/method_from_var.c3

@@ -1,4 +1,4 @@
-def NodeNotifyHandler = fn void(TreeView* this, TreeNode* node, String prop, void* data);
+alias NodeNotifyHandler = fn void(TreeView* this, TreeNode* node, String prop, void* data);
 fn void TreeView.nodeNotifyHandler(TreeView* this, TreeNode* node, String prop, void* data) @private {}
 
 struct TreeNode { int abc; NodeNotifyHandler notifyHandler; }

test/test_suite/methods/method_ref_for_extension_method.c3

@@ -9,7 +9,7 @@ fn bool Foo[].is_empty(Foo[] array) {
   return array.len == 0;
 }
 
-def foo_arr_is_empty = Foo[].is_empty;
+alias foo_arr_is_empty = Foo[].is_empty;
 
 fn void main() {
   Foo[] foos = { (Foo) { .i = 0 } };