Fix formatting of external with as
attribute and _
placeholder
#6970
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Fix #6966
The cause of the issue had to do with how
@as
attribute is handled with external.external foo: (~x: int, ~y: int) => _ = ""
,foo
has arity of 2. However,external foo: (~x: @as(true) _, ~y: int) => _ = ""
,foo
here has arity of 1.It happens here,
https://github.com/rescript-lang/rescript-compiler/blob/897cc228d0c2e259dde1628f2d9ccd2305b8194d/jscomp/syntax/src/res_core.ml#L4324-L4338