Improve DUAL_X_CARRIAGE sanity check errors
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		@@ -398,14 +398,18 @@
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 * Dual X Carriage requirements
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 */
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#if ENABLED(DUAL_X_CARRIAGE)
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  #if EXTRUDERS == 1 || ENABLED(COREXY) \
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      || !HAS_X2_ENABLE || !HAS_X2_STEP || !HAS_X2_DIR \
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      || !defined(X2_HOME_POS) || !defined(X2_MIN_POS) || !defined(X2_MAX_POS) \
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      || !HAS_X_MAX
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    #error "Missing or invalid definitions for DUAL_X_CARRIAGE mode."
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  #endif
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  #if X_HOME_DIR != -1 || X2_HOME_DIR != 1
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    #error "Please use canonical x-carriage assignment."
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  #if EXTRUDERS == 1
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    #error "DUAL_X_CARRIAGE requires 2 (or more) extruders."
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  #elif ENABLED(COREXY) || ENABLED(COREXZ)
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    #error "DUAL_X_CARRIAGE cannot be used with COREXY or COREXZ."
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  #elif !HAS_X2_ENABLE || !HAS_X2_STEP || !HAS_X2_DIR
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    #error "DUAL_X_CARRIAGE requires X2 stepper pins to be defined."
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  #elif !HAS_X_MAX
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    #error "DUAL_X_CARRIAGE requires USE_XMAX_PLUG and an X Max Endstop."
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  #elif !defined(X2_HOME_POS) || !defined(X2_MIN_POS) || !defined(X2_MAX_POS)
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    #error "DUAL_X_CARRIAGE requires X2_HOME_POS, X2_MIN_POS, and X2_MAX_POS."
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  #elif X_HOME_DIR != -1 || X2_HOME_DIR != 1
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    #error "DUAL_X_CARRIAGE requires X_HOME_DIR -1 and X2_HOME_DIR 1."
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  #endif
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#endif // DUAL_X_CARRIAGE
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