matrix-js-sdk's unit tests fail against matrix-rust-sdk 0.10.0

[richvdh]

Attempts to build matrix-js-sdk against latest matrix-rust sdk (matrix-org/matrix-js-sdk#4710) fail spectacularly, with errors such as:

Error: RuntimeError: memory access out of bounds

    at dlmalloc::dlmalloc::Dlmalloc<A>::malloc::hf8a67dcfc015198c (wasm:/wasm/matrix_sdk_crypto_wasm.wasm-014788a2:1:1116238)
    at __rust_alloc (wasm:/wasm/matrix_sdk_crypto_wasm.wasm-014788a2:1:3660961)
    at alloc::alloc::Global::alloc_impl::h9ad6c4e8df741cce.161 (wasm:/wasm/matrix_sdk_crypto_wasm.wasm-014788a2:1:3511853)
    at <alloc::alloc::Global as core::alloc::Allocator>::allocate::hc8e006bb905e0b48.160 (wasm:/wasm/matrix_sdk_crypto_wasm.wasm-014788a2:1:3498526)
    at alloc::raw_vec::RawVecInner<A>::try_allocate_in::h2c50790afc640f64 (wasm:/wasm/matrix_sdk_crypto_wasm.wasm-014788a2:1:3042789)
    at <T as core::convert::Into<U>>::into::ha7c59c96056e8f20 (wasm:/wasm/matrix_sdk_crypto_wasm.wasm-014788a2:1:3389301)
    at userid_new multivalue shim (wasm:/wasm/matrix_sdk_crypto_wasm.wasm-014788a2:1:3570699)
    at new UserId (node_modules/@matrix-org/matrix-sdk-crypto-wasm/pkg/matrix_sdk_crypto_wasm_bg.cjs:8954:22)
    at src/rust-crypto/index.ts:155:9
    at asyncGeneratorStep (node_modules/@babel/runtime/helpers/asyncToGenerator.js:3:17)
    at _next (node_modules/@babel/runtime/helpers/asyncToGenerator.js:17:9)
    at node_modules/@babel/runtime/helpers/asyncToGenerator.js:22:7
    at node_modules/@babel/runtime/helpers/asyncToGenerator.js:14:12
    at apply (src/rust-crypto/index.ts:142:30)
    at initOlmMachine (src/rust-crypto/index.ts:125:30)
    at asyncGeneratorStep (node_modules/@babel/runtime/helpers/asyncToGenerator.js:3:17)
    at _next (node_modules/@babel/runtime/helpers/asyncToGenerator.js:17:9)

Having bisected, it looks like our problems began with 9ff3761.

[richvdh]

Having bisected, it looks like our problems began with 9ff3761.

Hrm no, I think my bisection was faulty. If I revert #193, the tests pass.