Mark an unreachable branch with an ALWAYS macro.

FossilOrigin-Name: d4755aca4b435eed62b54af84013f7f176d3fa5b7b1c243555d59de5749fcde5

manifest

@@ -1,5 +1,5 @@
-C New\stest\scase\sin\sfuzzdata8.db.
-D 2019-06-11T16:07:39.003
+C Mark\san\sunreachable\sbranch\swith\san\sALWAYS\smacro.
+D 2019-06-11T16:43:58.413
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -456,7 +456,7 @@ F spec.template 86a4a43b99ebb3e75e6b9a735d5fd293a24e90ca
 F sqlite.pc.in 42b7bf0d02e08b9e77734a47798d1a55a9e0716b
 F sqlite3.1 fc7ad8990fc8409983309bb80de8c811a7506786
 F sqlite3.pc.in 48fed132e7cb71ab676105d2a4dc77127d8c1f3a
-F src/alter.c 29fcfd07f75b6cae9bbd18ff9a5768f80203ca8196a41839fb04ec5d3d99888e
+F src/alter.c 12f8c9a79ab51f7574998e3ed28dbafe59bbf0e8a435443c80bc788f661586f7
 F src/analyze.c 58db66344a5c58dcabb57f26696f6f2993956c830446da40b444051d2fdaf644
 F src/attach.c 78e986baee90cb7b83fb9eafa79c22581a8ada14030fd633b0683c95cf11213c
 F src/auth.c 0fac71038875693a937e506bceb492c5f136dd7b1249fbd4ae70b4e8da14f9df
@@ -1830,7 +1830,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 25b89630206fdbb41c756e98f99baa711d35a8c226697a92339d0fe7e8b3652a
-R 441e44e5006149b9106762a360154ee6
+P e96641f0be7d4454215459b0a95cf1c46ba0133e46d0bae22269741c8f4e5b44
+R 7d7dff82d0b7963bbc938a7ab08b7358
 U drh
-Z 03cffffbef03cc11c3be0beeb7f9b2b0
+Z b7b0b5e48d9017530c5e5509ff9ff70f

manifest.uuid

@@ -1 +1 @@
-e96641f0be7d4454215459b0a95cf1c46ba0133e46d0bae22269741c8f4e5b44
+d4755aca4b435eed62b54af84013f7f176d3fa5b7b1c243555d59de5749fcde5

src/alter.c

@@ -731,7 +731,7 @@ static int renameUnmapExprCb(Walker *pWalker, Expr *pExpr){
 ** Walker callback used by sqlite3RenameExprUnmap().
 */
 static int renameUnmapSelectCb(Walker *pWalker, Select *p){
-  if( p->pSrc ){
+  if( ALWAYS(p->pSrc) ){  /* Every Select as a SrcList, even if it is empty */
     Parse *pParse = pWalker->pParse;
     int i;
     for(i=0; i<p->pSrc->nSrc; i++){