uint shl uint causes type mismatch compile error

[demotomohiro]

mytests/test.nim:

discard 1'u shl 1'u

$ ./bin/nimony c -r mytests/test.nim 
bin/nimsem  m nifcache/tes9hvujc.1.nif nifcache/tes9hvujc.2.nif nifcache/tes9hvujc.2.idx.nif
Traceback (most recent call last)
src/nimony/nimsem.nim(116) nimsem
src/nimony/nimsem.nim(113) handleCmdLine
src/nimony/nimsem.nim(50) singleModule
src/nimony/sem.nim(6002) semcheck
src/nimony/sem.nim(758) semStmt
src/nimony/sem.nim(5710) semExpr
src/nimony/sem.nim(3702) semDiscard
src/nimony/sem.nim(5784) semExpr
src/nimony/sem.nim(1712) semCall
/home/player/worktmpfs/nim-2.3.1/lib/system/iterators_1.nim(1544) resolveOverloads
src/nimony/sembasics.nim(165) buildErr
mytests/test.nim(1, 13) Error: Type mismatch at [position]
[2] expected: (i -1) but got: (u -1)
[1] expected: +16 but got: -1
[1] expected: (i +16) but got: (u -1)
[1] expected: +32 but got: -1
[1] expected: (i +32) but got: (u -1)
[1] expected: (i +8) but got: (u -1)
[1] expected: (i +64) but got: (u -1)
[1] expected: +8 but got: -1
Type mismatch at [position]
[2] expected: (i -1) but got: (u -1)
[1] expected: +16 but got: -1
[1] expected: (i +16) but got: (u -1)
[1] expected: +32 but got: -1
[1] expected: (i +32) but got: (u -1)
[1] expected: (i +8) but got: (u -1)
[1] expected: (i +64) but got: (u -1)
[1] expected: +8 but got: -1

lib/std/hashes.nim uses uint and shl.