private void CheckReferenceToVariable(BoundExpression node, Symbol symbol)
{
Debug.Assert(
symbol.Kind == SymbolKind.Local ||
symbol.Kind == SymbolKind.Parameter ||
symbol is LocalFunctionSymbol
);
if (
_staticLocalOrAnonymousFunction is object &&
Symbol.IsCaptured(symbol, _staticLocalOrAnonymousFunction)
)
{
var diagnostic =
_staticLocalOrAnonymousFunction.MethodKind == MethodKind.LocalFunction
? ErrorCode.ERR_StaticLocalFunctionCannotCaptureVariable
: ErrorCode.ERR_StaticAnonymousFunctionCannotCaptureVariable;
Error(
diagnostic,
node,
new FormattedSymbol(symbol, SymbolDisplayFormat.ShortFormat)
);
}
}
private void CheckReferenceToVariable(BoundExpression node, Symbol symbol)
{
Debug.Assert(symbol.Kind == SymbolKind.Local || symbol.Kind == SymbolKind.Parameter || symbol is LocalFunctionSymbol);
if (_staticLocalFunction is object && Symbol.IsCaptured(symbol, _staticLocalFunction))
{
Error(ErrorCode.ERR_StaticLocalFunctionCannotCaptureVariable, node, new FormattedSymbol(symbol, SymbolDisplayFormat.ShortFormat));
}
}
private bool IsCapturedInLocalFunction(int slot)
{
if (slot <= 0)
{
return(false);
}
// Find the root slot, since that would be the only
// slot, if any, that is captured in a local function
var rootVarInfo = variableBySlot[RootSlot(slot)];
var rootSymbol = rootVarInfo.Symbol;
// A variable is captured in a local function iff its
// container is higher in the tree than the nearest
// local function
var nearestLocalFunc = GetNearestLocalFunctionOpt(CurrentSymbol);
return(!(nearestLocalFunc is null) && Symbol.IsCaptured(rootSymbol, nearestLocalFunc));
}