[ test ] Add test for idris-lang#2159

Author: spcfox

tests/idris2/coverage/coverage031/Issue2159.idr

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+plusRRNever1 : {r:Nat} -> plus r r = 1 -> Void
+plusRRNever1 {r = 0} Refl impossible
+plusRRNever1 {r = (S 0)} Refl impossible
+plusRRNever1 {r = (S (S k))} prf = ?somethingWrong

tests/idris2/coverage/coverage031/expected

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+1/1: Building Issue2159 (Issue2159.idr)
+Warning: Issue2159:2:19--2:20:Can't deal with fromInteger in impossible clauses yet
+
+Issue2159:2:19--2:20
+ 1 | plusRRNever1 : {r:Nat} -> plus r r = 1 -> Void
+ 2 | plusRRNever1 {r = 0} Refl impossible
+                       ^
+
+Warning: Issue2159:3:22--3:23:Can't deal with fromInteger in impossible clauses yet
+
+Issue2159:3:22--3:23
+ 1 | plusRRNever1 : {r:Nat} -> plus r r = 1 -> Void
+ 2 | plusRRNever1 {r = 0} Refl impossible
+ 3 | plusRRNever1 {r = (S 0)} Refl impossible
+                          ^
+

tests/idris2/coverage/coverage031/run

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+. ../../../testutils.sh
+
+check Issue2159.idr