Details
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Bug
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Resolution: Invalid
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P2: Important
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6.8
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None
Description
In strict mode, the following code produces a type error, when executed from QML (by imorting a .js file or by having it directly in a .qml file):
var foo = new WeakMap(); foo.set = ...; // <- TypeError
The code seems to fail on a `SetLookup` instruction for the assignment, producing a `TypeError` when in strict mode:
MOTH_BEGIN_INSTR(SetLookup)
STORE_IP();
STORE_ACC();
QV4::Lookup *l = function->executableCompilationUnit()->runtimeLookups + index;
if (!l->setter(l, engine, STACK_VALUE(base), accumulator) && function->isStrict())
engine->throwTypeError(); // <- Here
CHECK_EXCEPTION;
MOTH_END_INSTR(SetLookup)
This seems specific to the usage of `WeakMap` as the same code doesn't produce an error when used, for example, with an `Array`.
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