Regression on devel - concat (and display) does not compile anymore

[mratsim]

nimble test and any proc that relies on concat including tensor display fails to compile on Nim devel.

Error is:

../src/tensor/display.nim(25, 27) template/generic instantiation of `disp3d` from here
../src/tensor/private/p_display.nim(94, 20) template/generic instantiation of `concat` from here
../src/tensor/shapeshifting.nim(211, 43) Error: type mismatch: got <HSlice[system.int, system.int], int literal(1)>
but expected one of:
proc `|`(a, b: typedesc): typedesc
  first type mismatch at position: 1
  required type: typedesc
  but expression '
0 .. pred(it, 1)' is of type: HSlice[system.int, system.int]

expression:
  0 .. pred(it, 1) | 1

Related: nim-lang/Nim@f6def42, nim-lang/Nim#8603 and nim-lang/Nim#8677

It seems like | is resolved too early and the compiler doesn't see:

Arraymancer/src/tensor/accessors_macros_syntax.nim

Lines 110 to 131 in 0a08949

	# Procs to manage all integer, slice, SteppedSlice
	proc `|`*(s: Slice[int], step: int): SteppedSlice {.noSideEffect, inline.}=
	## Internal: A ``SteppedSlice`` constructor
	## Input:
	## - a slice
	## - a step
	## Returns:
	## - a ``SteppedSlice``
	return SteppedSlice(a: s.a, b: s.b, step: step)
	proc `|`*(b, step: int): Step {.noSideEffect, inline.}=
	## Internal: A ``Step`` constructor
	##
	## ``Step`` is a workaround due to operator precedence.
	##
	## [0..10|1] is interpreted as [0..(10|1)]
	## Input:
	## - the end of a slice range
	## - a step
	## Returns:
	## - a ``Step``
	return Step(b: b, step: step)