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SSO strings: bugfix (#25810)

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This commit is contained in:
Andreas Rumpf
2026-05-12 23:20:10 +02:00
committed by GitHub
parent f0c60b06e5
commit 6204e48ba5
6 changed files with 54 additions and 10 deletions
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5
compiler/semdata.nim
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@@ -637,6 +637,11 @@ proc renderNotLValue*(n: PNode): string =
elif n.kind in {nkHiddenStdConv, nkHiddenSubConv} and n.len == 2:
result = typeToString(n.typ.skipTypes(abstractVar)) & "(" & result & ")"
proc isSsoStringIndex*(conf: ConfigRef; n: PNode): bool =
result = conf.usesSso() and n.kind == nkBracketExpr and n.len >= 1 and
n[0].typ != nil and
n[0].typ.skipTypes(abstractVar + abstractInst - {tyTypeDesc}).kind == tyString
proc isAssignable(c: PContext, n: PNode): TAssignableResult =
result = parampatterns.isAssignable(c.p.owner, n)

4
compiler/sempass2.nim
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@@ -809,6 +809,10 @@ proc trackOperandForIndirectCall(tracked: PEffects, n: PNode, formals: PType; ar
markSideEffect(tracked, a, n.info)
let paramType = if formals != nil and argIndex < formals.signatureLen: formals[argIndex] else: nil
if paramType != nil and paramType.kind in {tyVar}:
let arg = n.skipAddr()
if isSsoStringIndex(tracked.config, arg):
localError(tracked.config, arg.info,
"expression '$1' is immutable, not 'var'" % renderNotLValue(arg))
invalidateFacts(tracked.guards, n)
if n.kind == nkSym and isLocalSym(tracked, n.sym):
makeVolatile(tracked, n.sym)