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feat: struct and tuple patterns in match (bootstrap + selfhost)

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Support destructuring in match arms:
- Tuple: (a, b) binds subject._0 / _1
- Struct: Point { x: px, y: py } and shorthand Point { x, y }

Bootstrap: matchPatternBindings for pkTuple/pkStruct; register local
tuple typedefs from function bodies. Selfhost: parse, Sema_BindPattern,
Lcx_PatternBindings with scope defines. Fix operator-overload path that
crashed when typeName was null after pattern binds.

Example: examples/struct_tuple_pat.bux. Selfhost-loop IDENTICAL.
This commit is contained in:
dimgigov
2026-07-18 01:15:44 +03:00
parent eac78f28c1
commit e3ca724bfa
12 changed files with 494 additions and 16 deletions
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bootstrap/lir_c_backend.nim
+50
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@@ -767,10 +767,60 @@ proc emitModule*(be: var LirCBackend, builder: LirBuilder, module: HirModule): s
else:
discard
proc walkHirForTuples(n: HirNode) =
if n == nil: return
registerTuple(n.typ)
case n.kind
of hAlloca:
registerTuple(n.allocaType)
of hBlock:
for s in n.blockStmts: walkHirForTuples(s)
walkHirForTuples(n.blockExpr)
of hIf:
walkHirForTuples(n.ifCond)
walkHirForTuples(n.ifThen)
walkHirForTuples(n.ifElse)
of hWhile:
walkHirForTuples(n.whileCond)
walkHirForTuples(n.whileBody)
of hLoop:
walkHirForTuples(n.loopBody)
of hReturn:
walkHirForTuples(n.returnValue)
of hStore:
walkHirForTuples(n.storePtr)
walkHirForTuples(n.storeValue)
of hAssign:
walkHirForTuples(n.assignTarget)
walkHirForTuples(n.assignValue)
of hBinary:
walkHirForTuples(n.binaryLeft)
walkHirForTuples(n.binaryRight)
of hUnary:
walkHirForTuples(n.unaryOperand)
of hCall:
for a in n.callArgs: walkHirForTuples(a)
of hCallIndirect:
walkHirForTuples(n.callIndirectCallee)
for a in n.callIndirectArgs: walkHirForTuples(a)
of hLoad:
walkHirForTuples(n.loadPtr)
of hFieldPtr:
walkHirForTuples(n.fieldPtrBase)
of hFieldAccess:
walkHirForTuples(n.fieldAccessBase)
of hStructInit:
for f in n.structInitFields: walkHirForTuples(f.value)
of hTupleInit:
for e in n.tupleInitElements: walkHirForTuples(e)
else:
discard
for f in module.funcs:
registerTuple(f.retType)
for p in f.params:
registerTuple(p.typ)
walkHirForTuples(f.body)
for ef in module.externFuncs:
registerTuple(ef.retType)
for p in ef.params: