cex: improve readability of the subsections

Now that the derivation is no longer printed on one line, aligning the
example and the derivation is no longer useful.  It can actually be
harmful, as it makes the overall structure less clear.

* src/derivation.h, src/derivation.c (derivation_print_leaves): Remove
the `prefix` argument.
* src/counterexample.c (print_counterexample): Put the example next to
its label.
* tests/conflicts.at, tests/counterexample.at, tests/diagnostics.at,
* tests/report.at: Adjust.

4 files changed, 70 insertions, 70 deletions

diff --git a/tests/conflicts.at b/tests/conflicts.at
index 187085c3..1cfae5b1 100644
--- a/tests/conflicts.at
+++ b/tests/conflicts.at
@@ -864,7 +864,7 @@ State 5
     shift/reduce conflict on token OP:
         1 exp: exp OP exp .
         1 exp: exp . OP exp
-      Example                  exp OP exp . OP exp
+      Example: exp OP exp . OP exp
       Shift derivation
         exp
         `-> exp OP exp
@@ -1212,7 +1212,7 @@ State 1
     reduce/reduce conflict on token $end:
         3 num: '0' .
         4 id: '0' .
-      Example                  '0' .
+      Example: '0' .
       First derivation
         exp
         `-> num
@@ -1767,12 +1767,12 @@ State 4
     shift/reduce conflict on token 'a':
        10 reported_conflicts: . %empty
         8 reported_conflicts: . 'a'
-      First example            resolved_conflict . 'a' 'a'
+      First example: resolved_conflict . 'a' 'a'
       Shift derivation
         start
         `-> resolved_conflict reported_conflicts 'a'
                               `-> . 'a'
-      Second example           resolved_conflict . 'a'
+      Second example: resolved_conflict . 'a'
       Reduce derivation
         start
         `-> resolved_conflict reported_conflicts 'a'
@@ -1781,12 +1781,12 @@ State 4
     shift/reduce conflict on token 'a':
        10 reported_conflicts: . %empty
         9 reported_conflicts: . 'a'
-      First example            resolved_conflict . 'a' 'a'
+      First example: resolved_conflict . 'a' 'a'
       Shift derivation
         start
         `-> resolved_conflict reported_conflicts 'a'
                               `-> . 'a'
-      Second example           resolved_conflict . 'a'
+      Second example: resolved_conflict . 'a'
       Reduce derivation
         start
         `-> resolved_conflict reported_conflicts 'a'
@@ -1806,7 +1806,7 @@ State 5
     reduce/reduce conflict on token 'a':
         8 reported_conflicts: 'a' .
         9 reported_conflicts: 'a' .
-      Example                  'a' .
+      Example: 'a' .
       First derivation
         reported_conflicts
         `-> 'a' .
@@ -1996,7 +1996,7 @@ AT_CHECK([[cat input.output | sed -n '/^State 0$/,/^State 1$/p']], 0,
     reduce/reduce conflict on token 'c':
        12 empty_c2: . %empty
        13 empty_c3: . %empty
-      Example                  . 'c'
+      Example: . 'c'
       First derivation
         start
         `-> empty_c2 'c'
diff --git a/tests/counterexample.at b/tests/counterexample.at
index f371ad14..97c72401 100644
--- a/tests/counterexample.at
+++ b/tests/counterexample.at
@@ -55,7 +55,7 @@ y: A | A B;
 AT_BISON_CHECK_CEX(
 [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
 input.y: warning: shift/reduce conflict on token B [-Wcounterexamples]
-  Example              A . B C
+  Example: A . B C
   Shift derivation
     s
     `-> y         c
@@ -95,7 +95,7 @@ bc: B bc C | B C;
 AT_BISON_CHECK_CEX(
 [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
 input.y: warning: shift/reduce conflict on token B [-Wcounterexamples]
-  Example              A . B C
+  Example: A . B C
   Shift derivation
     s
     `-> ac
@@ -107,7 +107,7 @@ input.y: warning: shift/reduce conflict on token B [-Wcounterexamples]
     `-> a       bc
         `-> A . `-> B C
 input.y: warning: shift/reduce conflict on token B [-Wcounterexamples]
-  Example              A A . B B C C
+  Example: A A . B B C C
   Shift derivation
     s
     `-> ac
@@ -157,7 +157,7 @@ xby: B | X xby Y;
 AT_BISON_CHECK_CEX(
 [[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr]
 input.y: warning: shift/reduce conflict on token B [-Wcounterexamples]
-  Example              A . B
+  Example: A . B
   Shift derivation
     s
     `-> A xby
@@ -168,14 +168,14 @@ input.y: warning: shift/reduce conflict on token B [-Wcounterexamples]
         `-> A x     `-> B y
               `-> .       `-> %empty
 input.y: warning: shift/reduce conflict on token B [-Wcounterexamples]
-  First example        A X . B Y $end
+  First example: A X . B Y $end
   Shift derivation
     $accept
     `-> s                     $end
         `-> A xby
               `-> X xby     Y
                     `-> . B
-  Second example       A X . B y $end
+  Second example: A X . B y $end
   Reduce derivation
     $accept
     `-> s                             $end
@@ -220,14 +220,14 @@ bc: B C;
 AT_BISON_CHECK_CEX(
 [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
 input.y: warning: shift/reduce conflict on token C [-Wcounterexamples]
-  First example        B . C $end
+  First example: B . C $end
   Shift derivation
     $accept
     `-> g                 $end
         `-> x
             `-> bc
                 `-> B . C
-  Second example       B . C D $end
+  Second example: B . C D $end
   Reduce derivation
     $accept
     `-> g                       $end
@@ -265,14 +265,14 @@ y: A A B;
 AT_BISON_CHECK_CEX(
 [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
 input.y: warning: shift/reduce conflict on token A [-Wcounterexamples]
-  First example        A . A B $end
+  First example: A . A B $end
   Shift derivation
     $accept
     `-> s                   $end
         `-> t
             `-> y
                 `-> A . A B
-  Second example       A . A $end
+  Second example: A . A $end
   Reduce derivation
     $accept
     `-> s                             $end
@@ -314,7 +314,7 @@ y: Y;
 AT_BISON_CHECK_CEX(
 [[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr]
 input.y: warning: shift/reduce conflict on token A [-Wcounterexamples]
-  Example              b . A X X Y
+  Example: b . A X X Y
   Shift derivation
     a
     `-> s
@@ -326,13 +326,13 @@ input.y: warning: shift/reduce conflict on token A [-Wcounterexamples]
         `-> b . `-> A x     xy
                       `-> X `-> X Y
 input.y: warning: shift/reduce conflict on token X [-Wcounterexamples]
-  First example        A X . X
+  First example: A X . X
   Shift derivation
     a
     `-> t
         `-> A xx
               `-> X . X
-  Second example       X . X xy
+  Second example: X . X xy
   Reduce derivation
     a
     `-> x       t
@@ -372,7 +372,7 @@ b : A | b;
 AT_BISON_CHECK_CEX(
 [[input.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr]
 input.y: warning: reduce/reduce conflict on token $end [-Wcounterexamples]
-  Example              A b .
+  Example: A b .
   First derivation
     a
     `-> A b .
@@ -409,13 +409,13 @@ b: D;
 AT_BISON_CHECK_CEX(
 [[input.y: warning: 2 reduce/reduce conflicts [-Wconflicts-rr]
 input.y: warning: reduce/reduce conflict on tokens A, C [-Wcounterexamples]
-  First example        D . A $end
+  First example: D . A $end
   First derivation
     $accept
     `-> s             $end
         `-> a       A
             `-> D .
-  Second example       B D . A $end
+  Second example: B D . A $end
   Second derivation
     $accept
     `-> s               $end
@@ -452,13 +452,13 @@ AT_BISON_CHECK_CEX(
 [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
 input.y: warning: shift/reduce conflict on token J [-Wcounterexamples]
 time limit exceeded: XXX
-  First example        H i . J K $end
+  First example: H i . J K $end
   Shift derivation
     $accept
     `-> a                 $end
         `-> H i
               `-> i . J K
-  Second example       H i . J $end
+  Second example: H i . J $end
   Reduce derivation
     $accept
     `-> s               $end
@@ -499,7 +499,7 @@ b: A B C | A B D;
 AT_BISON_CHECK_CEX(
 [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
 input.y: warning: shift/reduce conflict on token B [-Wcounterexamples]
-  Example              N A . B C
+  Example: N A . B C
   Shift derivation
     s
     `-> n
@@ -511,7 +511,7 @@ input.y: warning: shift/reduce conflict on token B [-Wcounterexamples]
         `-> N a       B
               `-> A .
 input.y: warning: shift/reduce conflict on token B [-Wcounterexamples]
-  Example              N N A . B D C
+  Example: N N A . B D C
   Shift derivation
     s
     `-> n
@@ -562,7 +562,7 @@ C : A c A;
 AT_BISON_CHECK_CEX(
 [[input.y: warning: 4 reduce/reduce conflicts [-Wconflicts-rr]
 input.y: warning: reduce/reduce conflict on tokens b, c [-Wcounterexamples]
-  Example              B . b c
+  Example: B . b c
   First derivation
     S
     `-> B                        C
@@ -576,7 +576,7 @@ input.y: warning: reduce/reduce conflict on tokens b, c [-Wcounterexamples]
                   `-> A     b A
                       `-> .   `-> %empty
 input.y: warning: reduce/reduce conflict on tokens b, c [-Wcounterexamples]
-  Example              C . c b
+  Example: C . c b
   First derivation
     S
     `-> C                        B
@@ -622,13 +622,13 @@ AT_BISON_CHECK_CEX(
 [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
 input.y: warning: 6 reduce/reduce conflicts [-Wconflicts-rr]
 input.y: warning: reduce/reduce conflict on token A [-Wcounterexamples]
-  First example        . c A A $end
+  First example: . c A A $end
   First derivation
     $accept
     `-> a                   $end
         `-> b     d
             `-> . `-> c A A
-  Second example       . c A A $end
+  Second example: . c A A $end
   Second derivation
     $accept
     `-> a                   $end
@@ -636,7 +636,7 @@ input.y: warning: reduce/reduce conflict on token A [-Wcounterexamples]
             `-> . `-> c A A
 input.y: warning: reduce/reduce conflict on token A [-Wcounterexamples]
 time limit exceeded: XXX
-  First example        b . c A A $end
+  First example: b . c A A $end
   First derivation
     $accept
     `-> a                             $end
@@ -644,7 +644,7 @@ time limit exceeded: XXX
               `-> a
                   `-> b     d
                       `-> . `-> c A A
-  Second example       b . A $end
+  Second example: b . A $end
   Second derivation
     $accept
     `-> a                 $end
@@ -653,7 +653,7 @@ time limit exceeded: XXX
                   `-> .
 input.y: warning: reduce/reduce conflict on token A [-Wcounterexamples]
 time limit exceeded: XXX
-  First example        c . c A A $end
+  First example: c . c A A $end
   First derivation
     $accept
     `-> a                             $end
@@ -661,7 +661,7 @@ time limit exceeded: XXX
               `-> a
                   `-> b     d
                       `-> . `-> c A A
-  Second example       c . A $end
+  Second example: c . A $end
   Second derivation
     $accept
     `-> a                 $end
@@ -670,12 +670,12 @@ time limit exceeded: XXX
                   `-> .
 input.y: warning: shift/reduce conflict on token A [-Wcounterexamples]
 time limit exceeded: XXX
-  First example        b c . A
+  First example: b c . A
   Shift derivation
     a
     `-> b d
           `-> c . A
-  Second example       b c . c A A $end
+  Second example: b c . c A A $end
   Reduce derivation
     $accept
     `-> a                                       $end
@@ -686,7 +686,7 @@ time limit exceeded: XXX
                             `-> b     d
                                 `-> . `-> c A A
 input.y: warning: reduce/reduce conflict on token A [-Wcounterexamples]
-  First example        b c . c A A $end
+  First example: b c . c A A $end
   First derivation
     $accept
     `-> a                                       $end
@@ -696,7 +696,7 @@ input.y: warning: reduce/reduce conflict on token A [-Wcounterexamples]
                         `-> a
                             `-> b     d
                                 `-> . `-> c A A
-  Second example       b c . A $end
+  Second example: b c . A $end
   Second derivation
     $accept
     `-> a                           $end
@@ -706,12 +706,12 @@ input.y: warning: reduce/reduce conflict on token A [-Wcounterexamples]
                         `-> c     A
                             `-> .
 input.y: warning: shift/reduce conflict on token A [-Wcounterexamples]
-  First example        b c . A
+  First example: b c . A
   Shift derivation
     a
     `-> b d
           `-> c . A
-  Second example       b c . A $end
+  Second example: b c . A $end
   Reduce derivation
     $accept
     `-> a                           $end
@@ -721,7 +721,7 @@ input.y: warning: shift/reduce conflict on token A [-Wcounterexamples]
                         `-> c     A
                             `-> .
 input.y: warning: reduce/reduce conflict on token $end [-Wcounterexamples]
-  Example              b d .
+  Example: b d .
   First derivation
     a
     `-> b d .
@@ -730,7 +730,7 @@ input.y: warning: reduce/reduce conflict on token $end [-Wcounterexamples]
     `-> b d
           `-> d .
 input.y: warning: reduce/reduce conflict on token $end [-Wcounterexamples]
-  Example              c d .
+  Example: c d .
   First derivation
     a
     `-> c d .
@@ -810,7 +810,7 @@ i: %empty | i J;
 AT_BISON_CHECK_CEX(
 [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
 input.y: warning: shift/reduce conflict on token J [-Wcounterexamples]
-  Example              H i J . J J
+  Example: H i J . J J
   Shift derivation
     s
     `-> a             J
@@ -854,7 +854,7 @@ d: D;
 AT_BISON_CHECK_CEX(
 [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
 input.y: warning: shift/reduce conflict on token D [-Wcounterexamples]
-  Example              A a . D
+  Example: A a . D
   Shift derivation
     s
     `-> A a d
@@ -896,13 +896,13 @@ d: D;
 AT_BISON_CHECK_CEX(
 [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
 input.y: warning: shift/reduce conflict on token D [-Wcounterexamples]
-  First example        A a . D $end
+  First example: A a . D $end
   Shift derivation
     $accept
     `-> s               $end
         `-> A a d
                 `-> . D
-  Second example       A a . D E $end
+  Second example: A a . D E $end
   Reduce derivation
     $accept
     `-> s                             $end
diff --git a/tests/diagnostics.at b/tests/diagnostics.at
index ffec2928..d92e8bf4 100644
--- a/tests/diagnostics.at
+++ b/tests/diagnostics.at
@@ -536,45 +536,45 @@ exp
 [1],
 [[input.y: <error>error:</error> shift/reduce conflicts: 4 found, 0 expected
 input.y: <warning>warning:</warning> shift/reduce conflict on token "+" [<warning>-Wcounterexamples</warning>]
-  Example              <cex-0><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf><cex-1> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
+  Example: <cex-0><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf><cex-1> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
   Shift derivation
     <cex-0><cex-step>exp</cex-step></cex-0>
     <cex-0><cex-step>↳ <cex-leaf>exp</cex-leaf><cex-leaf> "+"</cex-leaf><cex-1><cex-step> exp</cex-step></cex-1></cex-step></cex-0>
     <cex-1><cex-step>          ↳ <cex-leaf>exp</cex-leaf><cex-dot> •</cex-dot><cex-leaf> "+"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-1>
-  Example              <cex-0><cex-1><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
+  Example: <cex-0><cex-1><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
   Reduce derivation
     <cex-0><cex-step>exp</cex-step></cex-0>
     <cex-0><cex-step>↳ <cex-1><cex-step>exp</cex-step></cex-1><cex-leaf>             "+"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-0>
     <cex-1><cex-step>  ↳ <cex-leaf>exp</cex-leaf><cex-leaf> "+"</cex-leaf><cex-leaf> exp</cex-leaf><cex-dot> •</cex-dot></cex-step></cex-1>
 input.y: <warning>warning:</warning> shift/reduce conflict on token "else" [<warning>-Wcounterexamples</warning>]
-  Example              <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
+  Example: <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
   Shift derivation
     <cex-0><cex-step>exp</cex-step></cex-0>
     <cex-0><cex-step>↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-1><cex-step> exp</cex-step></cex-1></cex-step></cex-0>
     <cex-1><cex-step>                  ↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-leaf> exp</cex-leaf><cex-dot> •</cex-dot><cex-leaf> "else"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-1>
-  Example              <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
+  Example: <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
   Reduce derivation
     <cex-0><cex-step>exp</cex-step></cex-0>
     <cex-0><cex-step>↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-1><cex-step> exp</cex-step></cex-1><cex-leaf>                     "else"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-0>
     <cex-1><cex-step>                  ↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-leaf> exp</cex-leaf><cex-dot> •</cex-dot></cex-step></cex-1>
 input.y: <warning>warning:</warning> shift/reduce conflict on token "+" [<warning>-Wcounterexamples</warning>]
-  Example              <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
+  Example: <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
   Shift derivation
     <cex-0><cex-step>exp</cex-step></cex-0>
     <cex-0><cex-step>↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-1><cex-step> exp</cex-step></cex-1></cex-step></cex-0>
     <cex-1><cex-step>                  ↳ <cex-leaf>exp</cex-leaf><cex-dot> •</cex-dot><cex-leaf> "+"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-1>
-  Example              <cex-0><cex-1><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
+  Example: <cex-0><cex-1><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
   Reduce derivation
     <cex-0><cex-step>exp</cex-step></cex-0>
     <cex-0><cex-step>↳ <cex-1><cex-step>exp</cex-step></cex-1><cex-leaf>                     "+"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-0>
     <cex-1><cex-step>  ↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-leaf> exp</cex-leaf><cex-dot> •</cex-dot></cex-step></cex-1>
 input.y: <warning>warning:</warning> shift/reduce conflict on token "+" [<warning>-Wcounterexamples</warning>]
-  Example              <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf><cex-1> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
+  Example: <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf><cex-1> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
   Shift derivation
     <cex-0><cex-step>exp</cex-step></cex-0>
     <cex-0><cex-step>↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "else"</cex-leaf><cex-1><cex-step> exp</cex-step></cex-1></cex-step></cex-0>
     <cex-1><cex-step>                             ↳ <cex-leaf>exp</cex-leaf><cex-dot> •</cex-dot><cex-leaf> "+"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-1>
-  Example              <cex-0><cex-1><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
+  Example: <cex-0><cex-1><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
   Reduce derivation
     <cex-0><cex-step>exp</cex-step></cex-0>
     <cex-0><cex-step>↳ <cex-1><cex-step>exp</cex-step></cex-1><cex-leaf>                                "+"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-0>
@@ -618,7 +618,7 @@ input.y:31.4: <warning>warning:</warning> empty rule without %empty [<warning>-W
       |    <fixit-insert>%empty</fixit-insert>
 input.y: <error>error:</error> reduce/reduce conflicts: 1 found, 0 expected
 input.y: <warning>warning:</warning> reduce/reduce conflict on token "X" [<warning>-Wcounterexamples</warning>]
-  Example              <cex-0><cex-1><cex-2><cex-3><cex-leaf>"X"</cex-leaf> <cex-dot>•</cex-dot></cex-3></cex-2></cex-1><cex-4></cex-4><cex-5><cex-6><cex-7><cex-8><cex-9><cex-10> <cex-leaf>"X"</cex-leaf></cex-10></cex-9></cex-8><cex-11> <cex-leaf>"quuux"</cex-leaf></cex-11></cex-7></cex-6></cex-5><cex-12><cex-13><cex-14> <cex-leaf>"X"</cex-leaf></cex-14></cex-13></cex-12></cex-0>
+  Example: <cex-0><cex-1><cex-2><cex-3><cex-leaf>"X"</cex-leaf> <cex-dot>•</cex-dot></cex-3></cex-2></cex-1><cex-4></cex-4><cex-5><cex-6><cex-7><cex-8><cex-9><cex-10> <cex-leaf>"X"</cex-leaf></cex-10></cex-9></cex-8><cex-11> <cex-leaf>"quuux"</cex-leaf></cex-11></cex-7></cex-6></cex-5><cex-12><cex-13><cex-14> <cex-leaf>"X"</cex-leaf></cex-14></cex-13></cex-12></cex-0>
   First derivation
     <cex-0><cex-step>exp</cex-step></cex-0>
     <cex-0><cex-step>↳ <cex-1><cex-step>x1</cex-step></cex-1><cex-4><cex-step>          e1</cex-step></cex-4><cex-5><cex-step>  foo1</cex-step></cex-5><cex-12><cex-step>                      x1</cex-step></cex-12></cex-step></cex-0>
@@ -628,7 +628,7 @@ input.y: <warning>warning:</warning> reduce/reduce conflict on token "X" [<warni
     <cex-8><cex-step>                        ↳ <cex-9><cex-step>x2</cex-step></cex-9></cex-step></cex-8><cex-11><cex-step>      ↳ <cex-leaf>"quuux"</cex-leaf></cex-step></cex-11>
     <cex-9><cex-step>                          ↳ <cex-10><cex-step>x3</cex-step></cex-10></cex-step></cex-9>
     <cex-10><cex-step>                            ↳ <cex-leaf>"X"</cex-leaf></cex-step></cex-10>
-  Example              <cex-0><cex-1><cex-2><cex-3><cex-leaf>"X"</cex-leaf> <cex-dot>•</cex-dot></cex-3></cex-2></cex-1><cex-4></cex-4><cex-5><cex-6><cex-7><cex-8><cex-9><cex-10> <cex-leaf>"X"</cex-leaf></cex-10></cex-9></cex-8><cex-11> <cex-leaf>"quuux"</cex-leaf></cex-11></cex-7></cex-6></cex-5><cex-12><cex-13><cex-14> <cex-leaf>"X"</cex-leaf></cex-14></cex-13></cex-12></cex-0>
+  Example: <cex-0><cex-1><cex-2><cex-3><cex-leaf>"X"</cex-leaf> <cex-dot>•</cex-dot></cex-3></cex-2></cex-1><cex-4></cex-4><cex-5><cex-6><cex-7><cex-8><cex-9><cex-10> <cex-leaf>"X"</cex-leaf></cex-10></cex-9></cex-8><cex-11> <cex-leaf>"quuux"</cex-leaf></cex-11></cex-7></cex-6></cex-5><cex-12><cex-13><cex-14> <cex-leaf>"X"</cex-leaf></cex-14></cex-13></cex-12></cex-0>
   Second derivation
     <cex-0><cex-step>exp</cex-step></cex-0>
     <cex-0><cex-step>↳ <cex-1><cex-step>y1</cex-step></cex-1><cex-4><cex-step>          e2</cex-step></cex-4><cex-5><cex-step>  bar1</cex-step></cex-5><cex-12><cex-step>                      y1</cex-step></cex-12></cex-step></cex-0>
diff --git a/tests/report.at b/tests/report.at
index 645c3b57..8d0a210b 100644
--- a/tests/report.at
+++ b/tests/report.at
@@ -1538,7 +1538,7 @@ AT_CHECK([LC_ALL="$locale" bison -fno-caret -o input.cc -rall -Wcex --graph=inpu
 [[input.y: warning: 3 shift/reduce conflicts [-Wconflicts-sr]
 input.y: warning: 3 reduce/reduce conflicts [-Wconflicts-rr]
 input.y: warning: shift/reduce conflict on token "⊕" [-Wcounterexamples]
-  Example              exp "+" exp • "⊕" exp
+  Example: exp "+" exp • "⊕" exp
   Shift derivation
     exp
     ↳ exp "+" exp
@@ -1548,7 +1548,7 @@ input.y: warning: shift/reduce conflict on token "⊕" [-Wcounterexamples]
     ↳ exp             "⊕" exp
       ↳ exp "+" exp •
 input.y: warning: reduce/reduce conflict on tokens $end, "+", "⊕" [-Wcounterexamples]
-  Example              exp "+" exp •
+  Example: exp "+" exp •
   First derivation
     exp
     ↳ exp "+" exp •
@@ -1556,7 +1556,7 @@ input.y: warning: reduce/reduce conflict on tokens $end, "+", "⊕" [-Wcounterex
     exp
     ↳ exp "+" exp •
 input.y: warning: shift/reduce conflict on token "⊕" [-Wcounterexamples]
-  Example              exp "+" exp • "⊕" exp
+  Example: exp "+" exp • "⊕" exp
   Shift derivation
     exp
     ↳ exp "+" exp
@@ -1566,7 +1566,7 @@ input.y: warning: shift/reduce conflict on token "⊕" [-Wcounterexamples]
     ↳ exp             "⊕" exp
       ↳ exp "+" exp •
 input.y: warning: shift/reduce conflict on token "⊕" [-Wcounterexamples]
-  Example              exp "⊕" exp • "⊕" exp
+  Example: exp "⊕" exp • "⊕" exp
   Shift derivation
     exp
     ↳ exp "⊕" exp
@@ -1576,7 +1576,7 @@ input.y: warning: shift/reduce conflict on token "⊕" [-Wcounterexamples]
     ↳ exp             "⊕" exp
       ↳ exp "⊕" exp •
 input.y: warning: shift/reduce conflict on token "+" [-Wcounterexamples]
-  Example              exp "⊕" exp • "+" exp
+  Example: exp "⊕" exp • "+" exp
   Shift derivation
     exp
     ↳ exp "⊕" exp
@@ -1586,7 +1586,7 @@ input.y: warning: shift/reduce conflict on token "+" [-Wcounterexamples]
     ↳ exp             "+" exp
       ↳ exp "⊕" exp •
 input.y: warning: shift/reduce conflict on token "+" [-Wcounterexamples]
-  Example              exp "⊕" exp • "+" exp
+  Example: exp "⊕" exp • "+" exp
   Shift derivation
     exp
     ↳ exp "⊕" exp
@@ -1742,7 +1742,7 @@ State 7
     shift/reduce conflict on token "⊕":
         2 exp: exp "+" exp •
         1 exp: exp • "⊕" exp
-      Example                  exp "+" exp • "⊕" exp
+      Example: exp "+" exp • "⊕" exp
       Shift derivation
         exp
         ↳ exp "+" exp
@@ -1755,7 +1755,7 @@ State 7
     reduce/reduce conflict on tokens $end, "+", "⊕":
         2 exp: exp "+" exp •
         3 exp: exp "+" exp •
-      Example                  exp "+" exp •
+      Example: exp "+" exp •
       First derivation
         exp
         ↳ exp "+" exp •
@@ -1766,7 +1766,7 @@ State 7
     shift/reduce conflict on token "⊕":
         3 exp: exp "+" exp •
         1 exp: exp • "⊕" exp
-      Example                  exp "+" exp • "⊕" exp
+      Example: exp "+" exp • "⊕" exp
       Shift derivation
         exp
         ↳ exp "+" exp
@@ -1795,7 +1795,7 @@ State 8
     shift/reduce conflict on token "⊕":
         1 exp: exp "⊕" exp •
         1 exp: exp • "⊕" exp
-      Example                  exp "⊕" exp • "⊕" exp
+      Example: exp "⊕" exp • "⊕" exp
       Shift derivation
         exp
         ↳ exp "⊕" exp
@@ -1808,7 +1808,7 @@ State 8
     shift/reduce conflict on token "+":
         1 exp: exp "⊕" exp •
         2 exp: exp • "+" exp
-      Example                  exp "⊕" exp • "+" exp
+      Example: exp "⊕" exp • "+" exp
       Shift derivation
         exp
         ↳ exp "⊕" exp
@@ -1821,7 +1821,7 @@ State 8
     shift/reduce conflict on token "+":
         1 exp: exp "⊕" exp •
         3 exp: exp • "+" exp
-      Example                  exp "⊕" exp • "+" exp
+      Example: exp "⊕" exp • "+" exp
       Shift derivation
         exp
         ↳ exp "⊕" exp