+## Arrays
+
+We already have some array tests, but this is where we put other
+ad-hoc things array related.
+
+###### test list
+ oceani_tests += arrays
+
+###### test: arrays
+
+ func main()
+ bools:[5]Boolean
+ strings:[4]string
+
+ bools[3] = strings[1] == "Hello"
+ bools[1] = strings[2] <= "there"
+
+ for i:=0; then i=i+1; while i<5:
+ j ::= i
+ ra:[j]number
+ ra[i-1] = i*i
+ ra[6] = 42 // mustn't crash
+ print '', bools[i], ra[j-1],
+ print
+
+###### output: arrays
+ False 0 True 1 False 4 False 9 False 16
+
+## Structures
+
+Time to test if structure declarations and accesses work correctly.
+
+###### test list
+ oceani_tests += structs
+
+###### test: structs
+
+ const three ::= 3
+ struct foo
+ size:[three]number
+ name:string
+ active:Boolean = True
+
+ struct baz { a:number; b:Boolean; }
+
+ func main
+ do
+ info:[4]foo
+
+ for i:=0; then i=i+1; while i < 4:
+ switch i
+ case 2: nm:= "peter"
+ case 0: nm:= "bob"
+ case 1: nm:= "jane"
+ else nm:= "janine"
+
+ info[i].name = nm
+ info[i].size[0] = i*i
+ if nm != "jane":
+ info[i].active = False
+
+ for i:=0; then i=i+1; while i < 4:
+ print info[i].name, info[i].active, info[i].size[0]
+
+###### output: structs
+
+ bob False 0
+ jane True 1
+ peter False 4
+ janine False 9
+
+## Test code with syntax errors
+
+Syntax errors aren't handled well yet - the result is almost always a
+single message about the first error. So this section will be fairly
+thin until we add proper parsing recovery in the face of common errors.
+
+A special case of syntax errors is token errors, when a token is only
+accepted because the parser doesn't know quite enough to reject it.
+There are handled better as they are quite local, so a single test
+program can trigger most of the possible errors.
+
+To handle erronous code, we need a different set of tests, as we need to
+capture `stderr`. The same test code will be used for type errors too.
+As error messages contain the line number, and we don't want changes to
+this file to change the reported numbers, we copy the code into a
+separate file first, then run from there.
+
+###### test code
+ @for t in $(oceani_failing_tests); do \
+ echo -n "Test $$t ... "; \
+ ./md2c oceani-tests.mdc "output: $$t" | grep -v '^#' > .tmp.want; \
+ echo '``````' > .tmp.code; \
+ ./md2c oceani-tests.mdc "test: $$t" | grep -v '^#' >> .tmp.code; \
+ ./oceani .tmp.code > .tmp.have 2>&1; \
+ if ! cmp -s .tmp.want .tmp.have; then \
+ echo "FAILED"; diff -u .tmp.want .tmp.have ; exit 1; fi ;\
+ echo "passed"; \
+ ./coverage_oceani --section "test: $$t" oceani-tests.mdc > /dev/null 2>&1 ;\
+ done || true
+
+###### test list
+ oceani_failing_tests := syn1
+ oceani_failing_tests += tokerr
+
+###### test: syn1
+
+ func main()
+ if then else while do
+
+###### output: syn1
+ .tmp.code:3:11: Syntax error in statement: then
+
+###### test: tokerr
+ func main()
+ a := 1i // imaginary numbers aren't understood
+ b:[2i]number // array sizes are handled separately
+ c:[3.14159]Boolean // array sizes must be integers
+ d:[1_000_000_000_000]number // they mustn't be huge
+ patn: string = "foo[ ,_]*bar"re // regexp strings are just a dream
+
+ multi := """
+ This is a multiline string
+ With an unsupportable suffix
+ """Aa
+
+ xx:unknown = 24
+ yy:[unknowable]number
+ zzsize := 4
+ zz:[zzsize]string // size must be constant, use ::=
+
+ // These numbers should be bad in all contexts: FIXME
+ aa:[00123]number
+
+###### output: tokerr
+ .tmp.code:3:13: error: unsupported number suffix: 1i
+ .tmp.code:4:11: error: unsupported number suffix: 2i
+ .tmp.code:5:11: error: array size must be an integer: 3.14159
+ .tmp.code:6:11: error: array size is too large: 1_000_000_000_000
+ .tmp.code:7:23: error: unsupported string suffix: "foo[ ,_]*bar"re
+ .tmp.code:9:17: error: unsupported string suffix: """
+ This is a multiline string
+ With an unsupportable suffix
+ """Aa
+ .tmp.code:14:11: error: undefined type: unknown
+ .tmp.code:15:12: error: name undeclared: unknowable
+ .tmp.code:17:12: error: array size must be a constant: zzsize
+ .tmp.code:20:12: error: unrecognised number: 00123
+
+## Tests for type errors
+
+Type error don't cause parsing to abort, so we can fit many in the
+one test program. Some type errors are found during the parse, others
+during type analysis which doesn't run if parsing failed. So we cannot
+fit everything in one.
+
+These programs were generated by looking for the
+various places that `type_err()` are called.
+
+###### test list
+ oceani_failing_tests += type_err1 type_err2 type_err3 type_err4
+
+###### test: type_err1
+
+ func main()
+ print "hello" ++ 5, 5 ++ "hello"
+
+ b ::= 3
+ b = b + 1
+
+ if 3 * 4 and not True: print "Weird"
+
+###### output: type_err1
+ .tmp.code:3:25: error: expected string found number
+ .tmp.code:3:28: error: expected string found number
+ .tmp.code:6:8: error: Cannot assign to a constant: b
+ .tmp.code:5:8: info: name was defined as a constant here
+ .tmp.code:6:8: error: Cannot assign to a constant: b
+ .tmp.code:5:8: info: name was defined as a constant here
+ .tmp.code:8:11: error: Arithmetic returns number but Boolean expected
+ oceani: type error in program - not running.
+
+###### test: type_err2
+
+ func main()
+ a := 1
+ a := 2
+ a ::= 3
+ a:number = 4
+ a ::number = 5
+ c:
+
+###### output: type_err2
+ .tmp.code:4:8: error: variable 'a' redeclared
+ .tmp.code:3:8: info: this is where 'a' was first declared
+ .tmp.code:5:8: error: variable 'a' redeclared
+ .tmp.code:3:8: info: this is where 'a' was first declared
+ .tmp.code:6:8: error: variable 'a' redeclared
+ .tmp.code:3:8: info: this is where 'a' was first declared
+ .tmp.code:7:8: error: variable 'a' redeclared
+ .tmp.code:3:8: info: this is where 'a' was first declared
+ .tmp.code:8:8: Variable declared with no type or value: c
+
+###### test: type_err3
+
+ struct foo
+ a: number
+ b:string = "hello"
+
+ func main()
+ c := "hello"
+ c = c + 1
+ c = "hello" ++ (True and False)
+ c = 4 < 5
+ print 45 + ( "Hello" ++ "there")
+ c[5] = 1
+
+ while
+ use 1
+ use True
+ use "Hello"
+ do
+ print
+ case 1: print "one"
+ case "Hello": print "Hello"
+
+ a1:[5]number; a2:[5]number; a3:[10]number; a4:[5]string
+ a1 = a2
+ a1 = a3
+ a1 = a4
+ a1[2] = "hello"
+ a4[1] = True
+ c = a2[3]
+
+ bar:foo
+ foo.c = 43
+ print c.foo
+ print bar.c
+ print bar.b + 42
+
+
+ // trigger 'labels not permitted' error message
+ while 1 if True else False:
+ print
+ case 2: print "two"
+
+###### output: type_err3
+ .tmp.code:8:12: error: expected number but variable 'c' is string
+ .tmp.code:7:8: info: this is where 'c' was set to string
+ .tmp.code:8:12: error: Arithmetic returns number but string expected
+ .tmp.code:7:8: info: variable 'c' was set as string here.
+ .tmp.code:9:24: error: Boolean operation found where string expected
+ .tmp.code:10:12: error: Comparison returns Boolean but string expected
+ .tmp.code:7:8: info: variable 'c' was set as string here.
+ .tmp.code:11:21: error: Concat returns string but number expected
+ .tmp.code:12:8: error: string cannot be indexed
+ .tmp.code:12:8: error: string cannot be indexed
+ .tmp.code:21:13: error: expected number found string
+ .tmp.code:17:16: error: expected number, found string
+ .tmp.code:24:8: error: cannot assign value of type [5]number
+ .tmp.code:25:13: error: expected [5]number but variable 'a3' is [10]number
+ .tmp.code:23:36: info: this is where 'a3' was set to [10]number
+ .tmp.code:25:8: error: cannot assign value of type [5]number
+ .tmp.code:26:13: error: expected [5]number but variable 'a4' is [5]string
+ .tmp.code:23:51: info: this is where 'a4' was set to [5]string
+ .tmp.code:26:8: error: cannot assign value of type [5]number
+ .tmp.code:27:16: error: expected number found string
+ .tmp.code:28:16: error: expected string found Boolean
+ .tmp.code:29:12: error: have number but need string
+ .tmp.code:7:8: info: variable 'c' was set as string here.
+ .tmp.code:32:8: error: variable used but not declared: foo
+ .tmp.code:32:8: error: field reference attempted on none, not a struct
+ .tmp.code:32:16: error: expected none found number
+ .tmp.code:33:14: error: field reference attempted on string, not a struct
+ .tmp.code:34:14: error: cannot find requested field in foo
+ .tmp.code:35:17: error: have string but need number
+ .tmp.code:39:29: error: expected number (labels not permitted) found Boolean
+ oceani: type error in program - not running.
+
+###### test: type_err4
+ func main()
+ a:=1; b=2; c::=3
+ print a, b, c
+
+###### output: type_err4
+ .tmp.code:3:14: error: variable used but not declared: b
+ .tmp.code:3:16: error: expected none found number
+ .tmp.code:3:14: info: variable 'b' was set as none here.
+ oceani: type error in program - not running.
+
+###### test list
+ oceani_failing_tests += type_err_const type_err_const1 missing_program
+
+###### test: type_err_const
+ const
+ foo :: number = 45
+ bar ::= "string" + 56
+ const
+ bar ::= "baz"
+ func main()
+ foo := 4
+ print foo, bar
+
+ // trigger duplicate-main error
+ func main()
+ foo := 6
+ print bar, foo
+
+###### output: type_err_const
+ .tmp.code:4:16: error: expected number found string
+ .tmp.code:6:8: error: name already declared: bar
+ .tmp.code:4:8: info: this is where 'bar' was first declared
+ .tmp.code:8:8: error: variable 'foo' redeclared
+ .tmp.code:3:8: info: this is where 'foo' was first declared
+ .tmp.code:13:8: error: variable 'foo' redeclared
+ .tmp.code:3:8: info: this is where 'foo' was first declared
+ .tmp.code:13:8: "main" defined a second time
+
+###### test: type_err_const1
+ const
+ foo : number = 45
+ bar := "string"
+ func main()
+ foo := 4
+ print foo, bar
+
+###### output: type_err_const1
+ .tmp.code:3:12: Syntax error in constant: :
+ .tmp.code:4:12: Syntax error in constant: :
+
+###### test: missing_program
+ const
+ foo::="bar"
+
+###### output: missing_program
+ oceani: no main function found.
+