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Merge pull request #119 from Ben10do/add-end-checks

Verify that IFs, REPTs and MACROs are terminated

--- a/src/asm/asmy.y

+++ b/src/asm/asmy.y

@@ -182,6 +182,10 @@

 		}

 	}

+	if (level != 0) {

+		fatalerror("Unterminated REPT block");

+	}

+

 	len=src-pCurrentBuffer->pBuffer-4;

 	src=pCurrentBuffer->pBuffer;

@@ -257,6 +261,10 @@

 		}

 	}

+	if (level != 0) {

+		fatalerror("Unterminated MACRO definition");

+	}

+

 	len=src-pCurrentBuffer->pBuffer-4;

 	src=pCurrentBuffer->pBuffer;

@@ -348,6 +356,10 @@

 		}

 	}

+	if (level != 0) {

+		fatalerror("Unterminated IF construct");

+	}

+

 	len=src-pCurrentBuffer->pBuffer;

 	yyskipbytes( len );

@@ -401,6 +413,10 @@

 				src+=1;

 			}

 		}

+	}

+

+	if (level != 0) {

+		fatalerror("Unterminated IF construct");

 	}

 	len=src-pCurrentBuffer->pBuffer;