diff --git a/core/compress/gzip/example.odin b/core/compress/gzip/example.odin
index c010d5979..635134e40 100644
--- a/core/compress/gzip/example.odin
+++ b/core/compress/gzip/example.odin
@@ -1,4 +1,4 @@
-//+ignore
+//+build ignore
 package gzip
 
 /*
diff --git a/core/compress/zlib/example.odin b/core/compress/zlib/example.odin
index ab7fb4cd8..19017b279 100644
--- a/core/compress/zlib/example.odin
+++ b/core/compress/zlib/example.odin
@@ -1,4 +1,4 @@
-//+ignore
+//+build ignore
 package zlib
 
 /*
diff --git a/core/image/png/example.odin b/core/image/png/example.odin
index c1e2f0c73..cd9788bd3 100644
--- a/core/image/png/example.odin
+++ b/core/image/png/example.odin
@@ -8,7 +8,7 @@
 
 	An example of how to use `load`.
 */
-//+ignore
+//+build ignore
 package png
 
 import "core:image"
diff --git a/core/intrinsics/intrinsics.odin b/core/intrinsics/intrinsics.odin
index 0146746e7..69f77cea2 100644
--- a/core/intrinsics/intrinsics.odin
+++ b/core/intrinsics/intrinsics.odin
@@ -1,5 +1,5 @@
 // This is purely for documentation
-//+ignore
+//+build ignore
 package intrinsics
 
 // Package-Related
diff --git a/core/math/big/internal.odin b/core/math/big/internal.odin
index dbcd16509..13aa96bef 100644
--- a/core/math/big/internal.odin
+++ b/core/math/big/internal.odin
@@ -25,8 +25,6 @@
 	TODO: Handle +/- Infinity and NaN.
 */
 
-
-//+ignore
 package math_big
 
 import "core:mem"
diff --git a/core/math/big/tune.odin b/core/math/big/tune.odin
index 78a20c12b..ec1ef9a5b 100644
--- a/core/math/big/tune.odin
+++ b/core/math/big/tune.odin
@@ -7,7 +7,7 @@
 	The code started out as an idiomatic source port of libTomMath, which is in the public domain, with thanks.
 */
 
-//+ignore
+//+build ignore
 package math_big
 
 import "core:time"
diff --git a/src/parser.cpp b/src/parser.cpp
index 286f6d7a2..4f93ed3e6 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -5634,6 +5634,8 @@ bool parse_file(Parser *p, AstFile *f) {
 						} else {
 							f->flags |= AstFile_IsLazy;
 						}
+					} else {
+						warning(tok, "Ignoring unknown tag '%.*s'", LIT(lc));
 					}
 				}
 			}
diff --git a/tests/core/math/big/test.odin b/tests/core/math/big/test.odin
index a289c89dd..8a44ec087 100644
--- a/tests/core/math/big/test.odin
+++ b/tests/core/math/big/test.odin
@@ -1,4 +1,3 @@
-//+ignore
 /*
 	Copyright 2021 Jeroen van Rijn <nom@duclavier.com>.
 	Made available under Odin's BSD-3 license.