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// Test equations can embed equation pieces built by functions
#let foo(v1, v2) = {
// Return an equation piece that would've been rendered in
// inline style if the piece is not embedded
$v1 v2^2$
}
#let bar(v1, v2) = {
// Return an equation piece that would've been rendered in
// block style if the piece is not embedded
$ v1 v2^2 $
}
#let baz(..sink) = {
// Return an equation piece built by joining arrays
sink.pos().map(x => $hat(#x)$).join(sym.and)
}
Inline $2 foo(alpha, (M+foo(a, b)))$.
Inline $2 bar(alpha, (M+foo(a, b)))$.
Inline $2 baz(x,y,baz(u, v))$.
$ 2 foo(alpha, (M+foo(a, b))) $
$ 2 bar(alpha, (M+foo(a, b))) $
$ 2 baz(x,y,baz(u, v)) $
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