Diagnose for invalid decl nesting + namespace lookup fixes. (#3397)

* Diagnose for invalid decl nesting.

* Fix.

* Fix.

* Fix.

* Fix `namespace` lookup and `using` resolution.

* fix project files.

* revert project files.

* Enhance namespace syntax, docs.

* Fixes.

---------

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/source/slang/slang-lower-to-ir.cpp b/source/slang/slang-lower-to-ir.cpp
index f0fd33e13..146f54932 100644
--- a/source/slang/slang-lower-to-ir.cpp
+++ b/source/slang/slang-lower-to-ir.cpp
@@ -2267,6 +2267,10 @@ static String getNameForNameHint(
     if(auto genericParentDecl = as<GenericDecl>(parentDecl))
         parentDecl = genericParentDecl->parentDecl;
 
+    // Skip past a FileDecl parent.
+    if (auto fileParentDecl = as<FileDecl>(parentDecl))
+        parentDecl = fileParentDecl->parentDecl;
+
     // A `ModuleDecl` can have a name too, but in the common case
     // we don't want to generate name hints that include the module
     // name, simply because they would lead to every global symbol
@@ -10148,6 +10152,13 @@ static void ensureAllDeclsRec(
             ensureAllDeclsRec(context, memberDecl);
         }
     }
+    else if (auto fileDecl = as<FileDecl>(decl))
+    {
+        for (auto memberDecl : fileDecl->members)
+        {
+            ensureAllDeclsRec(context, memberDecl);
+        }
+    }
     else if (auto genericDecl = as<GenericDecl>(decl))
     {
         ensureAllDeclsRec(context, genericDecl->inner);