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better error message for 'proc' that is not intended to be used as a typeclass

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This commit is contained in:
Andreas Rumpf
2018-12-15 09:09:46 +01:00
parent f76bd06643
commit 446f911a17
1 changed files with 8 additions and 4 deletions
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12
compiler/semstmts.nim
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@@ -1090,9 +1090,13 @@ proc typeSectionRightSidePass(c: PContext, n: PNode) =
proc checkForMetaFields(c: PContext; n: PNode) =
template checkMeta(t) =
proc checkMeta(c: PContext; n: PNode; t: PType) =
if t != nil and t.isMetaType and tfGenericTypeParam notin t.flags:
localError(c.config, n.info, errTIsNotAConcreteType % t.typeToString)
if t.kind == tyBuiltInTypeClass and t.len == 1 and t.sons[0].kind == tyProc:
localError(c.config, n.info, ("'$1' is not a concrete type; " &
"for a callback without parameters use 'proc()'") % t.typeToString)
else:
localError(c.config, n.info, errTIsNotAConcreteType % t.typeToString)
if n.isNil: return
case n.kind
@@ -1107,9 +1111,9 @@ proc checkForMetaFields(c: PContext; n: PNode) =
tyProc, tyGenericInvocation, tyGenericInst, tyAlias, tySink:
let start = ord(t.kind in {tyGenericInvocation, tyGenericInst})
for i in start ..< t.len:
checkMeta(t.sons[i])
checkMeta(c, n, t.sons[i])
else:
checkMeta(t)
checkMeta(c, n, t)
else:
internalAssert c.config, false