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Show correct compiler error message in UART0.cpp
Cross checked with the files UART1 to UART3, only UART0 needs the fix.
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cores/arduino/UART0.cpp

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Original file line numberDiff line numberDiff line change
@@ -51,7 +51,7 @@ ISR(HWSERIAL0_DRE_VECTOR)
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Serial._tx_data_empty_irq();
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}
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#else
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#error "Don't know what the Data Received interrupt vector is called for Serial"
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#error "Don't know what the Data Register Empty interrupt vector is called for Serial"
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#endif
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#if defined(HWSERIAL0)

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