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support for inferring static[T] concept params

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This commit is contained in:
Zahary Karadjov 2016-08-02 05:15:19 +03:00
commit 76c663f692
8 changed files with 144 additions and 28 deletions
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20
compiler/semstmts.nim
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@ -1553,6 +1553,11 @@ proc usesResult(n: PNode): bool =
for c in n:
if usesResult(c): return true
proc inferConceptStaticParam(c: PContext, typ: PType, n: PNode) =
let res = semConstExpr(c, n)
if not sameType(res.typ, typ.base): localError(n.info, "")
typ.n = res
proc semStmtList(c: PContext, n: PNode, flags: TExprFlags): PNode =
# these must be last statements in a block:
const
@ -1604,10 +1609,19 @@ proc semStmtList(c: PContext, n: PNode, flags: TExprFlags): PNode =
n.typ = n.sons[i].typ
return
else:
n.sons[i] = semExpr(c, n.sons[i])
if c.inTypeClass > 0 and n[i].typ != nil:
case n[i].typ.kind
var expr = semExpr(c, n.sons[i])
n.sons[i] = expr
if c.inTypeClass > 0 and expr.typ != nil:
case expr.typ.kind
of tyBool:
if expr.kind == nkInfix and expr[0].sym.name.s == "==":
if expr[1].typ.isUnresolvedStatic:
inferConceptStaticParam(c, expr[1].typ, expr[2])
continue
elif expr[2].typ.isUnresolvedStatic:
inferConceptStaticParam(c, expr[2].typ, expr[1])
continue
let verdict = semConstExpr(c, n[i])
if verdict.intVal == 0:
localError(result.info, "type class predicate failed")