Possible bug - Nim compiler doesn't catch dup except:, but clang does

[bobg]

$ cat nim_bug.nim

# compiler bug - should catch duplicate except: clauses

var mine = 47

try:
    mine = 27
except:
    echo "first"
except:
    echo "second"

$ nim c -r nim_bug.nim

Hint: used config file '/Users/bobgus/Nim/config/nim.cfg' [Conf] Hint: system 
[Processing] Hint: nim_bug [Processing] CC: nim_bug Error: execution of an 
external compiler program 'clang -c -w -I/Users/bobgus/Nim/lib -o 
/Users/bobgus/fileDB/nimcache/nim_bug.o 
/Users/bobgus/fileDB/nimcache/nim_bug.c' failed with exit code: 1

/Users/bobgus/fileDB/nimcache/nim_bug.c:405:3: error: expected expression
    else { ^

1 error generated. $