chore(users): grfn -> aspen

Change-Id: I6c6847fac56f0a9a1a2209792e00a3aec5e672b9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10809
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: lukegb <lukegb@tvl.fyi>

users/aspen/achilles/ach/.gitignore

@@ -0,0 +1,7 @@
+*.ll
+*.o
+
+functions
+simple
+externs
+units

users/aspen/achilles/ach/Makefile

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+default: simple
+
+%.ll: %.ach
+	cargo run -- compile $< -o $@ -f llvm
+
+%.o: %.ll
+	llc $< -o $@ -filetype=obj
+
+%: %.o
+	clang $< -o $@
+
+.PHONY: clean
+
+clean:
+	@rm -f *.ll *.o simple functions

users/aspen/achilles/ach/externs.ach

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+extern puts : fn cstring -> int
+
+fn main =
+    let _ = puts "foobar"
+    in 0

users/aspen/achilles/ach/functions.ach

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+ty id : fn a -> a
+fn id x = x
+
+ty plus : fn int -> int
+fn plus (x: int) (y: int) = x + y
+
+ty main : fn -> int
+fn main = plus (id 2) 7

users/aspen/achilles/ach/simple.ach

@@ -0,0 +1 @@
+fn main = let x = 2; y = 3 in x + y

users/aspen/achilles/ach/units.ach

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+extern puts : fn cstring -> int
+
+ty print : fn cstring -> ()
+fn print x = let _ = puts x in ()
+
+ty main : fn -> int
+fn main = let _ = print "hi" in 0