first commit

test/cram/test.t

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+test 1:
+  $ dune exec -- scfg test1.scfg
+  train Shinkansen {
+    model E5 {
+      max-speed 320km/h
+      weight 453.5t
+      lines-served Tōhoku Hokkaido
+    }
+    model E7 {
+      max-speed 275km/h
+      weight 540t
+      lines-served Hokuriku Jōetsu
+    }
+    escapetests "A random line" "abracket{line" "anotherbracket}line" 'aquote"line' "anesc\\line" "asq'line" 'adq"line' 'asinglequote"{} \line' 'asinglequote"justewithadq' "dq\"and'sq"
+    emptytests "" ""
+    "an escaped name" a b c
+    namewithoutparam
+    p "unesc\nnewline" "unesc\rcr" "unesc\ttab"
+    q "new line \n" "cr \r" "tab \t"
+  }
+test 2:
+  $ dune exec -- scfg parse_start_with_newline.scfg
+  wo lo lo {
+    a b c
+  }
+lex error 1:
+  $ dune exec -- scfg lex_error.scfg
+  File lex_error.scfg, line 1, character 2: unexpected lexeme `"`
+  [1]
+parse error 1:
+  $ dune exec -- scfg parse_error1.scfg
+  File parse_error1.scfg, line 1, character 2: unexpected lexeme `{`
+  [1]
+parse error 2:
+  $ dune exec -- scfg parse_error2.scfg
+  File parse_error2.scfg, line 2, character 0: unexpected token EOF
+  [1]
+parse error 3:
+  $ dune exec -- scfg parse_error3.scfg
+  File parse_error3.scfg, line 1, character 2: unexpected lexeme `}`
+  [1]
+parse error 4:
+  $ dune exec -- scfg parse_error4.scfg
+  File parse_error4.scfg, line 1, character 2: unexpected lexeme `{`
+  [1]
+bug 1:
+  $ dune exec -- scfg bug1.scfg
+  "" {
+    "" {
+      ""
+    }
+    "" {
+      ""
+    }
+    "" ""
+    ""
+  }
+bug 2:
+  $ dune exec -- scfg bug2.scfg
+  
+
+
+bug 3:
+  $ dune exec -- scfg bug3.scfg
+  edff