We are not running std tests for wasm

[jyn514]

I tried this code:

x test library --exclude alloc --stage 0

I expected to see this happen: "Testing stage0 library artifacts {std, panic_abort, core, panic_unwind, unwind, proc_macro, test} (x86_64-unknown-linux-gnu)"

Instead, this happened: "Testing stage0 library artifacts"

This gets worse - if I just pass x test --exclude alloc, then the entire step gets skipped. In particular, this means that

rust/src/ci/docker/host-x86_64/wasm32/Dockerfile

Lines 57 to 59 in eadf69a

	# Exclude library/alloc due to OOM in benches.
	ENV SCRIPT python3 ../x.py test --stage 2 --host='' --target $TARGETS \
	--exclude library/alloc

is excluding all standard library tests, not just the ones for alloc.

Meta

HEAD is branched from 19ee7f4a6abaf00f3d11d1c7f1d3508b55c84aa1 (which is going to land on master shortly).

[LuuuXXX]

This should be the main cause of the problem.

rust/src/bootstrap/builder.rs

Lines 257 to 260 in eadf69a

	fn maybe_run(&self, builder: &Builder<'_>, pathsets: Vec<PathSet>) {
	if pathsets.iter().any(|set| self.is_excluded(builder, set)) {
	return;
	}