X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.scl.runtime%2Fscl%2FPrelude.scl;h=eb8026de910e15f2b8900c2e0fce6a6d6a0d0d6e;hp=a926ae40ec3b0ca4ffb4c635132c3fa9eaa58f9e;hb=e9757cdfe5996d87738cabad84bff0343f56e4e3;hpb=1a6b9cd08ff2ef21446a77e422b2cc35914730cb

diff --git a/bundles/org.simantics.scl.runtime/scl/Prelude.scl b/bundles/org.simantics.scl.runtime/scl/Prelude.scl
index a926ae40e..eb8026de9 100644
--- a/bundles/org.simantics.scl.runtime/scl/Prelude.scl
+++ b/bundles/org.simantics.scl.runtime/scl/Prelude.scl
@@ -2214,6 +2214,12 @@ importJava "java.lang.Throwable" where
     @private
     @JavaName toString
     showThrowable :: Throwable -> String
+    @private
+    @JavaName getMessage 
+    getMessageThrowable :: Throwable -> String
+    @private
+    @JavaName getCause 
+    getCauseThrowable :: Throwable -> Maybe Throwable
 importJava "java.lang.Exception" where
     data Exception
     @private
@@ -2225,6 +2231,20 @@ instance Show Throwable where
 instance Show Exception where
     show = showException
 
+class Throwable e where
+    toThrowable :: e -> Throwable
+
+messageOfException :: Throwable e => e -> String
+messageOfException = getMessageThrowable . toThrowable
+
+causeOfException :: Throwable e => e -> Maybe Throwable
+causeOfException = getCauseThrowable . toThrowable
+
+instance Throwable Throwable where
+    toThrowable = id
+instance Throwable Exception where
+    toThrowable = Java.unsafeCoerce
+
 "Prints the given value in the console."
 @inline
 print :: Show a => a -> <Proc> ()