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improved error message for #291

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Araq 2013-04-11 19:24:08 +02:00
commit f5db2de696
1 changed files with 4 additions and 1 deletions
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compiler/semcall.nim
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@ -174,7 +174,10 @@ proc explicitGenericInstantiation(c: PContext, n: PNode, s: PSym): PNode =
# common case; check the only candidate has the right
# number of generic type parameters:
if safeLen(s.ast.sons[genericParamsPos]) != n.len-1:
return explicitGenericInstError(n)
let expected = safeLen(s.ast.sons[genericParamsPos])
LocalError(n.info, errGenerated, "cannot instantiate: " & renderTree(n) &
"; got " & $(n.len-1) & " type(s) but expected " & $expected)
return n
result = explicitGenericSym(c, n, s)
elif a.kind in {nkClosedSymChoice, nkOpenSymChoice}:
# choose the generic proc with the proper number of type parameters.