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-rw-r--r--src/demo.sml3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/demo.sml b/src/demo.sml
index ebdf4e40..4e2caa99 100644
--- a/src/demo.sml
+++ b/src/demo.sml
@@ -197,7 +197,8 @@ fun make {prefix, dirname, guided} =
ext = SOME s}
val src' = OS.Path.file src
in
- if OS.FileSys.access (src, []) then
+ if String.isPrefix (OS.Path.mkCanonical dirname) src
+ andalso OS.FileSys.access (src, []) then
(TextIO.output (out, " | <a target=\"showcase\" href=\"");
TextIO.output (out, src');
TextIO.output (out, ".html\"><tt>");