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implemented return type inference

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Other fixes:
* bind once is now the default for type classes as documented in the manual
* fixes an issue in template overloading (erroneous  ambiguity when different typedesc params were used)
This commit is contained in:
Zahary Karadjov 2012-09-29 16:49:04 +03:00
commit 7e44015491
9 changed files with 104 additions and 36 deletions
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7
compiler/sigmatch.nim
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@ -282,7 +282,12 @@ proc matchTypeClass(c: var TCandidate, typeClass, t: PType): TTypeRelation =
# if the loop finished without returning, either all constraints matched
# or none of them matched.
result = if tfAny in typeClass.flags: isNone else: isGeneric
proc matchTypeClass*(typeClass, typ: PType): bool =
var c: TCandidate
InitCandidate(c, typeClass)
result = matchTypeClass(c, typeClass, typ) == isGeneric
proc procTypeRel(c: var TCandidate, f, a: PType): TTypeRelation =
proc inconsistentVarTypes(f, a: PType): bool {.inline.} =
result = f.kind != a.kind and (f.kind == tyVar or a.kind == tyVar)