diff options
Diffstat (limited to 'compiler/semexprs.nim')
| -rw-r--r-- | compiler/semexprs.nim | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/compiler/semexprs.nim b/compiler/semexprs.nim index d920b0f25..56de00d56 100644 --- a/compiler/semexprs.nim +++ b/compiler/semexprs.nim @@ -2267,13 +2267,19 @@ proc semMagic(c: PContext, n: PNode, s: PSym, flags: TExprFlags): PNode = of mSizeOf: markUsed(c, n.info, s) result = semSizeof(c, setMs(n, s)) + of mSetLengthSeq: + result = semDirectOp(c, n, flags) + let seqType = result[1].typ.skipTypes({tyPtr, tyRef, # in case we had auto-dereferencing + tyVar, tyGenericInst, tyOwned, tySink, + tyAlias, tyUserTypeClassInst}) + if seqType.kind == tySequence and seqType.base.requiresInit: + localError(c.config, n.info, "setLen can potentially expand the sequence, " & + "but the element type $1 doesn't have a default value.", + [typeToString(seqType.base)]) of mDefault: result = semDirectOp(c, n, flags) c.config.internalAssert result[1].typ.kind == tyTypeDesc - let typ = result[1].typ.base - if typ.kind == tyObject: - checkDefaultConstruction(c, typ, n.info) - elif typ.kind in {tyRef, tyPtr} and tfNotNil in typ.flags: + if result[1].typ.base.requiresInit: localError(c.config, n.info, "not nil types don't have a default value") else: result = semDirectOp(c, n, flags) |