2 files changed, 9 insertions, 1 deletions
diff --git a/source/core/slang-io.cpp b/source/core/slang-io.cpp
index c11ba85e0..17cd60160 100644
--- a/source/core/slang-io.cpp
+++ b/source/core/slang-io.cpp
@@ -101,7 +101,8 @@ namespace Slang
             char* chars = tempFileName.prepareForAppend(count);
 
             // https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-gettempfilenamea
-            //  Generates a temporary file name. 
+            // Generates a temporary file name.
+            // Will create a file with this name.
             DWORD ret = ::GetTempFileNameA(tempPath.getBuffer(), prefix.getBuffer(), 0, chars);
 
             if (ret == 0)
@@ -111,6 +112,8 @@ namespace Slang
             tempFileName.appendInPlace(chars, ::strlen(chars));
         }
 
+        SLANG_ASSERT(File::exists(tempFileName));
+
         outFileName = tempFileName;
         return SLANG_OK;
     }
@@ -135,6 +138,8 @@ namespace Slang
         close(handle);
 
         outFileName = buffer.getBuffer();
+        SLANG_ASSERT(File::exists(outFileName));
+
         return SLANG_OK;
     }
 #endif
diff --git a/source/core/slang-io.h b/source/core/slang-io.h
index 51b1d45e5..43812aaf9 100644
--- a/source/core/slang-io.h
+++ b/source/core/slang-io.h
@@ -27,6 +27,9 @@ namespace Slang
 
         static SlangResult makeExecutable(const String& fileName);
 
+            /// Creates a temporary file typically in some way based on the prefix
+            /// The file will be *created* with the outFileName, on success.
+            /// It's creation in necessary to lock that particular name.  
         static SlangResult generateTemporary(const UnownedStringSlice& prefix, String& outFileName);
     };