Hello,
Attached is a patch to give a little more information
for "java.lang.IllegalArgumentException: Don't know how
to create ISeq from:" error.
The current behavior is:
user=> (map identity 1)
java.lang.IllegalArgumentException: Don't know how to create ISeq
from: Integer
java.lang.IllegalArgumentException: Don't know how to create ISeq
from: Integer
......... snipped ........
with patch:
user=> (map identity 1)
java.lang.IllegalArgumentException: Don't know how to create ISeq
from: Integer : 1
java.lang.IllegalArgumentException: Don't know how to create ISeq
from: Integer : 1
............ snipped ............
I found it a helpful to understand macro expansion errors
better:
user=> (macroexpand '(field-write-priv x :c 20 (vector :a :b)))
java.lang.IllegalArgumentException: Don't know how to create ISeq
from: Symbol : G__2867
java.lang.RuntimeException: java.lang.IllegalArgumentException:
Don't know how to create ISeq from: Symbol : G__2867
at clojure.lang.LazyCons.rest(LazyCons.java:63)
at clojure.lang.RT.printInnerSeq(RT.java:1320)
....... snipped ..........
at clojure.lang.RT.print(RT.java:1173)
at clojure.lang.Repl.main(Repl.java:76)
Caused by: java.lang.IllegalArgumentException: Don't know how to
create ISeq from: Symbol : G__2867
at clojure.lang.RT.seqFrom(RT.java:461)
....... snipped ..........
at clojure.lang.LazyCons.rest(LazyCons.java:59)
... 11 more
(let* [G__2867 (vector :a :b)] (if (clojure.contrib.pred/empty?
G__2867) (clojure/list (quote clojure/assoc) x :c 20) (user/field-
write-priv x (clojure/last G__2867) (clojure/list (quote clojure/
assoc) (clojure/-> xuser=> java.lang.IllegalArgumentException:
Don't know how to create ISeq from: Symbol : G__2716
I am not a Java or Clojure expert so there may be a
better way to do this. Patch follows.
Parth
[parth:~/src/clojure/src/jvm/clojure/lang]% svn update
At revision 1006.
[parth:~/src/clojure/src/jvm/clojure/lang]% svn diff RT.java
Index: RT.java
===================================================================
--- RT.java (revision 1006)
+++ RT.java (working copy)
@@ -458,7 +458,7 @@
// else if(coll instanceof Enumeration)
// return EnumerationSeq.create(((Enumeration) coll));
else
- throw new IllegalArgumentException("Don't know how to
create ISeq from: " + coll.getClass().getSimpleName());
+ throw new IllegalArgumentException("Don't know how to
create ISeq from: " + coll.getClass().getSimpleName() + " : " +
coll.toString());
}
static public ISeq keys(Object coll){
[parth:~/src/clojure/src/jvm/clojure/lang]%
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