-AT_BISON_CHECK([-o test.c test.y], 1, [],
-[[test.y:50.51-60: error: invalid reference: '$<ival>lo9'
-test.y:50.3-68: symbol not found in production: lo9
-test.y:51.51-60: warning: misleading reference: '$<ival>exp'
-test.y:42.1-3: refers to: $exp at $$
-test.y:51.7: possibly meant: $x, hiding $exp at $1
-test.y:51.41: possibly meant: $r, hiding $exp at $4
-test.y:52.51-52: error: $l of 'exp' has no declared type
-test.y:55.40-43: error: invalid reference: '$r12'
-test.y:55.3-47: symbol not found in production: r12
-test.y:56.29-33: error: invalid reference: '$expo'
-test.y:56.3-46: symbol not found in production: expo
+AT_BISON_CHECK([-fcaret -o test.c test.y], 1, [],
+[[test.y:52.51-60: error: invalid reference: '$<ival>lo9'
+ | exp[x] '+' { $<ival>$ = $x; } [l] exp[r] { $$ = $<ival>lo9 + $r; }
+ ^^^^^^^^^^
+test.y:52.3-68: symbol not found in production: lo9
+ | exp[x] '+' { $<ival>$ = $x; } [l] exp[r] { $$ = $<ival>lo9 + $r; }
+ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+test.y:53.51-60: warning: misleading reference: '$<ival>exp' [-Wother]
+ | exp[x] '-' { $<ival>$ = $x; } [l] exp[r] { $$ = $<ival>exp - $r; }
+ ^^^^^^^^^^
+test.y:44.1-3: refers to: $exp at $$
+ exp:
+ ^^^
+test.y:53.7: possibly meant: $x, hiding $exp at $1
+ | exp[x] '-' { $<ival>$ = $x; } [l] exp[r] { $$ = $<ival>exp - $r; }
+ ^
+test.y:53.41: possibly meant: $r, hiding $exp at $4
+ | exp[x] '-' { $<ival>$ = $x; } [l] exp[r] { $$ = $<ival>exp - $r; }
+ ^
+test.y:54.51-52: error: $l of 'exp' has no declared type
+ | exp[x] '*' { $<ival>$ = $x; } [l] exp[r] { $$ = $l * $r; }
+ ^^
+test.y:57.40-43: error: invalid reference: '$r12'
+ | exp[l] '^' exp[r] { $$ = power ($l, $r12); }
+ ^^^^
+test.y:57.3-47: symbol not found in production: r12
+ | exp[l] '^' exp[r] { $$ = power ($l, $r12); }
+ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+test.y:58.29-33: error: invalid reference: '$expo'
+ | '(' exp ')' { $$ = $expo; }
+ ^^^^^
+test.y:58.3-46: symbol not found in production: expo
+ | '(' exp ')' { $$ = $expo; }
+ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^