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The parser was incorrectly handling the parsing of declarative element segments whose `init` is a `vec(expr)`.
https://webassembly.github.io/spec/core/binary/modules.html#element-section
Binry parser was simply reading a single `u32LEB` value for `init`
instead of parsing a expression regardless `usesExpressions = true`.
This commit updates the `WasmBinaryReader::readElementSegments` function
to correctly parse the expressions for declarative element segments by
calling `readExpression` instead of `getU32LEB` when `usesExpressions = true`.
Resolves the parsing exception:
"[parse exception: bad section size, started at ... not being equal to new position ...]"
Related discussion: https://github.com/tanishiking/scala-wasm/issues/136
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