phasm/codestyle.py

@@ -54,7 +54,7 @@ def expression(inp: ourlang.Expression) -> str:
         # could not fit in the given float type
         return str(inp.value)
 
-    if isinstance(inp, (ourlang.ConstantTuple, ourlang.ConstantStaticArray, )):
+    if isinstance(inp, ourlang.ConstantTuple):
         return '(' + ', '.join(
             expression(x)
             for x in inp.value
@@ -65,8 +65,8 @@ def expression(inp: ourlang.Expression) -> str:
 
     if isinstance(inp, ourlang.UnaryOp):
         if (
-            inp.operator in ourlang.WEBASSEMBLY_BUILDIN_FLOAT_OPS
-            or inp.operator in ourlang.WEBASSEMBLY_BUILDIN_BYTES_OPS):
+            inp.operator in ourlang.WEBASSEMBLY_BUILTIN_FLOAT_OPS
+            or inp.operator in ourlang.WEBASSEMBLY_BUILTIN_BYTES_OPS):
             return f'{inp.operator}({expression(inp.right)})'
 
         if inp.operator == 'cast':
@@ -186,7 +186,7 @@ def module(inp: ourlang.Module) -> str:
 
     for func in inp.functions.values():
         if func.lineno < 0:
-            # Buildin (-2) or auto generated (-1)
+            # Builtin (-2) or auto generated (-1)
             continue
 
         if result:

phasm/compiler.py

@@ -247,11 +247,11 @@ def expression(wgn: WasmGenerator, inp: ourlang.Expression) -> None:
         mtyp = typing.simplify(inp.type_var)
 
         if mtyp == 'f32':
-            if inp.operator in ourlang.WEBASSEMBLY_BUILDIN_FLOAT_OPS:
+            if inp.operator in ourlang.WEBASSEMBLY_BUILTIN_FLOAT_OPS:
                 wgn.add_statement(f'f32.{inp.operator}')
                 return
         if mtyp == 'f64':
-            if inp.operator in ourlang.WEBASSEMBLY_BUILDIN_FLOAT_OPS:
+            if inp.operator in ourlang.WEBASSEMBLY_BUILTIN_FLOAT_OPS:
                 wgn.add_statement(f'f64.{inp.operator}')
                 return
 
@@ -608,7 +608,7 @@ def module_data(inp: ourlang.ModuleData) -> bytes:
                 data_list.append(module_data_f64(constant.value))
                 continue
 
-            raise NotImplementedError(constant, mtyp)
+            raise NotImplementedError(constant, constant.type_var, mtyp)
 
         block_data = b''.join(data_list)
 

phasm/ourlang.py

@@ -7,8 +7,8 @@ import enum
 
 from typing_extensions import Final
 
-WEBASSEMBLY_BUILDIN_FLOAT_OPS: Final = ('abs', 'sqrt', 'ceil', 'floor', 'trunc', 'nearest', )
-WEBASSEMBLY_BUILDIN_BYTES_OPS: Final = ('len', )
+WEBASSEMBLY_BUILTIN_FLOAT_OPS: Final = ('abs', 'sqrt', 'ceil', 'floor', 'trunc', 'nearest', )
+WEBASSEMBLY_BUILTIN_BYTES_OPS: Final = ('len', )
 
 from .typing import (
     TypeStruct,
@@ -57,18 +57,6 @@ class ConstantTuple(Constant):
         super().__init__()
         self.value = value
 
-class ConstantStaticArray(Constant):
-    """
-    A StaticArray constant value expression within a statement
-    """
-    __slots__ = ('value', )
-
-    value: List[ConstantPrimitive]
-
-    def __init__(self, value: List[ConstantPrimitive]) -> None: # FIXME: Arrays of arrays?
-        super().__init__()
-        self.value = value
-
 class VariableReference(Expression):
     """
     An variable reference expression within a statement

phasm/parser.py

@@ -6,24 +6,22 @@ from typing import Any, Dict, NoReturn, Union
 import ast
 
 from .typing import (
+    BUILTIN_TYPES,
+
     TypeStruct,
     TypeStructMember,
-    TypeTuple,
-    TypeTupleMember,
-    TypeStaticArray,
-    TypeStaticArrayMember,
 )
 
 from .exceptions import StaticError
 from .ourlang import (
-    WEBASSEMBLY_BUILDIN_FLOAT_OPS,
+    WEBASSEMBLY_BUILTIN_FLOAT_OPS,
 
     Module, ModuleDataBlock,
     Function,
 
     Expression,
     BinaryOp,
-    ConstantPrimitive, ConstantTuple, ConstantStaticArray,
+    ConstantPrimitive, ConstantTuple,
 
     FunctionCall, Subscript,
     # StructConstructor, TupleConstructor,
@@ -482,7 +480,7 @@ class OurVisitor:
             # struct_constructor = StructConstructor(struct)
             #
             # func = module.functions[struct_constructor.name]
-        if node.func.id in WEBASSEMBLY_BUILDIN_FLOAT_OPS:
+        if node.func.id in WEBASSEMBLY_BUILTIN_FLOAT_OPS:
             if 1 != len(node.args):
                 _raise_static_error(node, f'Function {node.func.id} requires 1 arguments but {len(node.args)} are given')
 
@@ -686,7 +684,7 @@ class OurVisitor:
             if not isinstance(node.ctx, ast.Load):
                 _raise_static_error(node, 'Must be load context')
 
-            if node.id in ('u8', 'u32', 'u64', 'i32', 'i64', 'f32', 'f64'): # FIXME: Source this list somewhere
+            if node.id in BUILTIN_TYPES:
                 return node.id
 
             raise NotImplementedError('TODO: Broken after type system')
@@ -697,40 +695,21 @@ class OurVisitor:
             _raise_static_error(node, f'Unrecognized type {node.id}')
 
         if isinstance(node, ast.Subscript):
-            raise NotImplementedError('TODO: Broken after new type system')
+            if not isinstance(node.value, ast.Name):
+                _raise_static_error(node, 'Must be name')
+            if not isinstance(node.slice, ast.Index):
+                _raise_static_error(node, 'Must subscript using an index')
+            if not isinstance(node.slice.value, ast.Constant):
+                _raise_static_error(node, 'Must subscript using a constant index')
+            if not isinstance(node.slice.value.value, int):
+                _raise_static_error(node, 'Must subscript using a constant integer index')
+            if not isinstance(node.ctx, ast.Load):
+                _raise_static_error(node, 'Must be load context')
 
-            # if not isinstance(node.value, ast.Name):
-            #     _raise_static_error(node, 'Must be name')
-            # if not isinstance(node.slice, ast.Index):
-            #     _raise_static_error(node, 'Must subscript using an index')
-            # if not isinstance(node.slice.value, ast.Constant):
-            #     _raise_static_error(node, 'Must subscript using a constant index')
-            # if not isinstance(node.slice.value.value, int):
-            #     _raise_static_error(node, 'Must subscript using a constant integer index')
-            # if not isinstance(node.ctx, ast.Load):
-            #     _raise_static_error(node, 'Must be load context')
-            #
-            # if node.value.id in module.types:
-            #     member_type = module.types[node.value.id]
-            # else:
-            #     _raise_static_error(node, f'Unrecognized type {node.value.id}')
-            #
-            # type_static_array = TypeStaticArray(member_type)
-            #
-            # offset = 0
-            #
-            # for idx in range(node.slice.value.value):
-            #     static_array_member = TypeStaticArrayMember(idx, offset)
-            #
-            #     type_static_array.members.append(static_array_member)
-            #     offset += member_type.alloc_size()
-            #
-            # key = f'{node.value.id}[{node.slice.value.value}]'
-            #
-            # if key not in module.types:
-            #     module.types[key] = type_static_array
-            #
-            # return module.types[key]
+            if node.value.id not in BUILTIN_TYPES: # FIXME: Tuple of tuples?
+                _raise_static_error(node, f'Unrecognized type {node.value.id}')
+
+            return f'{node.value.id}[{node.slice.value.value}]'
 
         if isinstance(node, ast.Tuple):
             raise NotImplementedError('TODO: Broken after new type system')

phasm/typer.py

@@ -3,7 +3,13 @@ Type checks and enriches the given ast
 """
 from . import ourlang
 
-from .typing import Context, TypeConstraintBitWidth, TypeConstraintPrimitive, TypeConstraintSigned, TypeVar, from_str
+from .exceptions import TypingError
+from .typing import (
+    Context,
+    TypeConstraintBitWidth, TypeConstraintPrimitive, TypeConstraintSigned, TypeConstraintSubscript,
+    TypeVar,
+    from_str,
+)
 
 def phasm_type(inp: ourlang.Module) -> None:
     module(inp)
@@ -55,6 +61,19 @@ def constant(ctx: Context, inp: ourlang.Constant) -> TypeVar:
 
         raise NotImplementedError(constant, inp, inp.value)
 
+    if isinstance(inp, ourlang.ConstantTuple):
+        result = ctx.new_var()
+
+        result.add_constraint(TypeConstraintSubscript(members=(
+            constant(ctx, x)
+            for x in inp.value
+        )))
+        result.add_location(str(inp.value))
+
+        inp.type_var = result
+
+        return result
+
     raise NotImplementedError(constant, inp)
 
 def expression(ctx: Context, inp: ourlang.Expression) -> 'TypeVar':
@@ -63,6 +82,8 @@ def expression(ctx: Context, inp: ourlang.Expression) -> 'TypeVar':
 
     if isinstance(inp, ourlang.VariableReference):
         assert inp.variable.type_var is not None
+
+        inp.type_var = inp.variable.type_var
         return inp.variable.type_var
 
     if isinstance(inp, ourlang.UnaryOp):
@@ -112,6 +133,32 @@ def expression(ctx: Context, inp: ourlang.Expression) -> 'TypeVar':
 
         return inp.function.returns_type_var
 
+    if isinstance(inp, ourlang.Subscript):
+        if not isinstance(inp.index, ourlang.ConstantPrimitive):
+            raise NotImplementedError(expression, inp, inp.index)
+        if not isinstance(inp.index.value, int):
+            raise NotImplementedError(expression, inp, inp.index.value)
+
+        expression(ctx, inp.varref)
+        assert inp.varref.type_var is not None
+
+        try:
+            # TODO: I'd much rather resolve this using the narrow functions
+            tc_subs = ctx.var_constraints[inp.varref.type_var.ctx_id][TypeConstraintSubscript]
+        except KeyError:
+            raise TypingError(f'Type cannot be subscripted: {inp.varref.type_var}') from None
+
+        assert isinstance(tc_subs, TypeConstraintSubscript) # type hint
+
+        try:
+            # TODO: I'd much rather resolve this using the narrow functions
+            member = tc_subs.members[inp.index.value]
+        except IndexError:
+            raise TypingError(f'Type cannot be subscripted with index {inp.index.value}: {inp.varref.type_var}') from None
+
+        inp.type_var = member
+        return member
+
     raise NotImplementedError(expression, inp)
 
 def function(ctx: Context, inp: ourlang.Function) -> None:

phasm/typing.py

@@ -1,9 +1,10 @@
 """
 The phasm type system
 """
-from typing import Dict, Iterable, Optional, List, Set, Type
+from typing import Callable, Dict, Iterable, Optional, List, Set, Type
 
 import enum
+import re
 
 from .exceptions import TypingError
 
@@ -151,7 +152,7 @@ class TypeConstraintBase:
     """
     Base class for classes implementing a contraint on a type
     """
-    def narrow(self, other: 'TypeConstraintBase') -> 'TypeConstraintBase':
+    def narrow(self, ctx: 'Context', other: 'TypeConstraintBase') -> 'TypeConstraintBase':
         raise NotImplementedError('narrow', self, other)
 
 class TypeConstraintPrimitive(TypeConstraintBase):
@@ -172,7 +173,7 @@ class TypeConstraintPrimitive(TypeConstraintBase):
     def __init__(self, primitive: Primitive) -> None:
         self.primitive = primitive
 
-    def narrow(self, other: 'TypeConstraintBase') -> 'TypeConstraintPrimitive':
+    def narrow(self, ctx: 'Context', other: 'TypeConstraintBase') -> 'TypeConstraintPrimitive':
         if not isinstance(other, TypeConstraintPrimitive):
             raise Exception('Invalid comparison')
 
@@ -196,7 +197,7 @@ class TypeConstraintSigned(TypeConstraintBase):
     def __init__(self, signed: Optional[bool]) -> None:
         self.signed = signed
 
-    def narrow(self, other: 'TypeConstraintBase') -> 'TypeConstraintSigned':
+    def narrow(self, ctx: 'Context', other: 'TypeConstraintBase') -> 'TypeConstraintSigned':
         if not isinstance(other, TypeConstraintSigned):
             raise Exception('Invalid comparison')
 
@@ -239,7 +240,7 @@ class TypeConstraintBitWidth(TypeConstraintBase):
                 if x <= maxb
             }
 
-    def narrow(self, other: 'TypeConstraintBase') -> 'TypeConstraintBitWidth':
+    def narrow(self, ctx: 'Context', other: 'TypeConstraintBase') -> 'TypeConstraintBitWidth':
         if not isinstance(other, TypeConstraintBitWidth):
             raise Exception('Invalid comparison')
 
@@ -251,7 +252,60 @@ class TypeConstraintBitWidth(TypeConstraintBase):
         return TypeConstraintBitWidth(oneof=new_oneof)
 
     def __repr__(self) -> str:
-        return 'BitWidth=oneof(' + ','.join(map(str, sorted(self.oneof))) + ')'
+        result = 'BitWidth='
+
+        items = list(sorted(self.oneof))
+        if not items:
+            return result
+
+        while items:
+            itm = items.pop(0)
+            result += str(itm)
+
+            cnt = 0
+            while cnt < len(items) and items[cnt] == itm + cnt + 1:
+                cnt += 1
+
+            if cnt == 1:
+                result += ',' + str(items[0])
+            elif cnt > 1:
+                result += '..' + str(items[cnt - 1])
+
+            items = items[cnt:]
+            if items:
+                result += ','
+
+        return result
+
+class TypeConstraintSubscript(TypeConstraintBase):
+    """
+    Contraint on allowing a type to be subscripted
+    """
+    __slots__ = ('members', )
+
+    members: List['TypeVar']
+
+    def __init__(self, *, members: Iterable['TypeVar']) -> None:
+        self.members = list(members)
+
+    def narrow(self, ctx: 'Context', other: 'TypeConstraintBase') -> 'TypeConstraintSubscript':
+        if not isinstance(other, TypeConstraintSubscript):
+            raise Exception('Invalid comparison')
+
+        if len(self.members) != len(other.members):
+            raise TypingNarrowProtoError('Member count does not match')
+
+        newmembers = []
+        for smb, omb in zip(self.members, other.members):
+            nmb = ctx.new_var()
+            ctx.unify(nmb, smb)
+            ctx.unify(nmb, omb)
+            newmembers.append(nmb)
+
+        return TypeConstraintSubscript(members=newmembers)
+
+    def __repr__(self) -> str:
+        return 'Subscript=(' + ','.join(map(repr, self.members)) + ')'
 
 class TypeVar:
     """
@@ -271,7 +325,7 @@ class TypeVar:
         csts = self.ctx.var_constraints[self.ctx_id]
 
         if newconst.__class__ in csts:
-            csts[newconst.__class__] = csts[newconst.__class__].narrow(newconst)
+            csts[newconst.__class__] = csts[newconst.__class__].narrow(self.ctx, newconst)
         else:
             csts[newconst.__class__] = newconst
 
@@ -413,6 +467,93 @@ def simplify(inp: TypeVar) -> Optional[str]:
 
     return None
 
+def make_u8(ctx: Context, location: str) -> TypeVar:
+    """
+    Makes a u8 TypeVar
+    """
+    result = ctx.new_var()
+    result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.INT))
+    result.add_constraint(TypeConstraintBitWidth(minb=8, maxb=8))
+    result.add_constraint(TypeConstraintSigned(False))
+    result.add_location(location)
+    return result
+
+def make_u32(ctx: Context, location: str) -> TypeVar:
+    """
+    Makes a u32 TypeVar
+    """
+    result = ctx.new_var()
+    result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.INT))
+    result.add_constraint(TypeConstraintBitWidth(minb=32, maxb=32))
+    result.add_constraint(TypeConstraintSigned(False))
+    result.add_location(location)
+    return result
+
+def make_u64(ctx: Context, location: str) -> TypeVar:
+    """
+    Makes a u64 TypeVar
+    """
+    result = ctx.new_var()
+    result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.INT))
+    result.add_constraint(TypeConstraintBitWidth(minb=64, maxb=64))
+    result.add_constraint(TypeConstraintSigned(False))
+    result.add_location(location)
+    return result
+
+def make_i32(ctx: Context, location: str) -> TypeVar:
+    """
+    Makes a i32 TypeVar
+    """
+    result = ctx.new_var()
+    result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.INT))
+    result.add_constraint(TypeConstraintBitWidth(minb=32, maxb=32))
+    result.add_constraint(TypeConstraintSigned(True))
+    result.add_location(location)
+    return result
+
+def make_i64(ctx: Context, location: str) -> TypeVar:
+    """
+    Makes a i64 TypeVar
+    """
+    result = ctx.new_var()
+    result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.INT))
+    result.add_constraint(TypeConstraintBitWidth(minb=64, maxb=64))
+    result.add_constraint(TypeConstraintSigned(True))
+    result.add_location(location)
+    return result
+
+def make_f32(ctx: Context, location: str) -> TypeVar:
+    """
+    Makes a f32 TypeVar
+    """
+    result = ctx.new_var()
+    result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.FLOAT))
+    result.add_constraint(TypeConstraintBitWidth(minb=32, maxb=32))
+    result.add_location(location)
+    return result
+
+def make_f64(ctx: Context, location: str) -> TypeVar:
+    """
+    Makes a f64 TypeVar
+    """
+    result = ctx.new_var()
+    result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.FLOAT))
+    result.add_constraint(TypeConstraintBitWidth(minb=32, maxb=32))
+    result.add_location(location)
+    return result
+
+BUILTIN_TYPES: Dict[str, Callable[[Context, str], TypeVar]] = {
+    'u8': make_u8,
+    'u32': make_u32,
+    'u64': make_u64,
+    'i32': make_i32,
+    'i64': make_i64,
+    'f32': make_f32,
+    'f64': make_f64,
+}
+
+TYPE_MATCH_STATIC_ARRAY = re.compile(r'^([uif][0-9]+)\[([0-9]+)\]')
+
 def from_str(ctx: Context, inp: str, location: str) -> TypeVar:
     """
     Creates a new TypeVar from the string
@@ -425,53 +566,21 @@ def from_str(ctx: Context, inp: str, location: str) -> TypeVar:
     This could be conidered part of parsing. Though that would give trouble
     with the context creation.
     """
+    if inp in BUILTIN_TYPES:
+        return BUILTIN_TYPES[inp](ctx, location)
+
+    match = TYPE_MATCH_STATIC_ARRAY.fullmatch(inp)
+    if match:
         result = ctx.new_var()
 
-    if inp == 'u8':
-        result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.INT))
-        result.add_constraint(TypeConstraintBitWidth(minb=8, maxb=8))
-        result.add_constraint(TypeConstraintSigned(False))
+        result.add_constraint(TypeConstraintSubscript(members=(
+            # Make copies so they don't get entangled
+            # with each other.
+            from_str(ctx, match[1], match[1])
+            for _ in range(int(match[2]))
+        )))
         result.add_location(location)
-        return result
 
-    if inp == 'u32':
-        result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.INT))
-        result.add_constraint(TypeConstraintBitWidth(minb=32, maxb=32))
-        result.add_constraint(TypeConstraintSigned(False))
-        result.add_location(location)
-        return result
-
-    if inp == 'u64':
-        result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.INT))
-        result.add_constraint(TypeConstraintBitWidth(minb=64, maxb=64))
-        result.add_constraint(TypeConstraintSigned(False))
-        result.add_location(location)
-        return result
-
-    if inp == 'i32':
-        result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.INT))
-        result.add_constraint(TypeConstraintBitWidth(minb=32, maxb=32))
-        result.add_constraint(TypeConstraintSigned(True))
-        result.add_location(location)
-        return result
-
-    if inp == 'i64':
-        result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.INT))
-        result.add_constraint(TypeConstraintBitWidth(minb=64, maxb=64))
-        result.add_constraint(TypeConstraintSigned(True))
-        result.add_location(location)
-        return result
-
-    if inp == 'f32':
-        result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.FLOAT))
-        result.add_constraint(TypeConstraintBitWidth(minb=32, maxb=32))
-        result.add_location(location)
-        return result
-
-    if inp == 'f64':
-        result.add_constraint(TypeConstraintPrimitive(TypeConstraintPrimitive.Primitive.FLOAT))
-        result.add_constraint(TypeConstraintBitWidth(minb=64, maxb=64))
-        result.add_location(location)
         return result
 
     raise NotImplementedError(from_str, inp)

pylintrc

@@ -7,4 +7,4 @@ max-line-length=180
 good-names=g
 
 [tests]
-disable=C0116,
+disable=C0116,R0201

tests/integration/runners.py

@@ -5,7 +5,6 @@ from typing import Any, Callable, Dict, Iterable, Optional, TextIO
 
 import ctypes
 import io
-import warnings
 
 import pywasm.binary
 import wasm3
@@ -42,10 +41,7 @@ class RunnerBase:
         Parses the Phasm code into an AST
         """
         self.phasm_ast = phasm_parse(self.phasm_code)
-        try:
         phasm_type(self.phasm_ast)
-        except NotImplementedError as exc:
-            warnings.warn(f'phasm_type throws an NotImplementedError on this test: {exc}')
 
     def compile_ast(self) -> None:
         """

tests/integration/test_code/test_typing.py

@@ -0,0 +1,20 @@
+import pytest
+
+from phasm import typing as sut
+
+class TestTypeConstraintBitWidth:
+    @pytest.mark.parametrize('oneof,exp', [
+        (set(), '', ),
+        ({1}, '1', ),
+        ({1,2}, '1,2', ),
+        ({1,2,3}, '1..3', ),
+        ({1,2,3,4}, '1..4', ),
+
+        ({1,3}, '1,3', ),
+        ({1,4}, '1,4', ),
+
+        ({1,2,3,4,6,7,8,9}, '1..4,6..9', ),
+    ])
+    def test_repr(self, oneof, exp):
+        mut_self = sut.TypeConstraintBitWidth(oneof=oneof)
+        assert ('BitWidth=' + exp) == repr(mut_self)

tests/integration/test_lang/test_primitives.py

@@ -219,7 +219,7 @@ def testEntry() -> {type_}:
 
 @pytest.mark.integration_test
 @pytest.mark.parametrize('type_', ['f32', 'f64'])
-def test_buildins_sqrt(type_):
+def test_builtins_sqrt(type_):
     code_py = f"""
 @exported
 def testEntry() -> {type_}:

tests/integration/test_lang/test_static_array.py

@@ -1,12 +1,12 @@
 import pytest
 
-from phasm.exceptions import StaticError
+from phasm.exceptions import StaticError, TypingError
 
-from ..constants import COMPLETE_PRIMITIVE_TYPES, TYPE_MAP
+from ..constants import ALL_INT_TYPES, COMPLETE_PRIMITIVE_TYPES, TYPE_MAP
 from ..helpers import Suite
 
 @pytest.mark.integration_test
-@pytest.mark.parametrize('type_', COMPLETE_PRIMITIVE_TYPES)
+@pytest.mark.parametrize('type_', ALL_INT_TYPES)
 def test_module_constant(type_):
     code_py = f"""
 CONSTANT: {type_}[3] = (24, 57, 80, )
@@ -59,6 +59,41 @@ def helper(array: {type_}[3]) -> {type_}:
     assert 161 == result.returned_value
     assert TYPE_MAP[type_] == type(result.returned_value)
 
+@pytest.mark.integration_test
+def test_module_constant_type_mismatch_bitwidth():
+    code_py = """
+CONSTANT: u8[3] = (24, 57, 280, )
+"""
+
+    with pytest.raises(TypingError, match='u8.*280'):
+        Suite(code_py).run_code()
+
+@pytest.mark.integration_test
+def test_module_constant_type_mismatch_not_subscriptable():
+    code_py = """
+CONSTANT: u8 = 24
+
+@exported
+def testEntry() -> u8:
+    return CONSTANT[0]
+"""
+
+    with pytest.raises(TypingError, match='Type cannot be subscripted:'):
+        Suite(code_py).run_code()
+
+@pytest.mark.integration_test
+def test_module_constant_type_mismatch_index_out_of_range():
+    code_py = """
+CONSTANT: u8[3] = (24, 57, 80, )
+
+@exported
+def testEntry() -> u8:
+    return CONSTANT[3]
+"""
+
+    with pytest.raises(TypingError, match='Type cannot be subscripted with index 3:'):
+        Suite(code_py).run_code()
+
 @pytest.mark.integration_test
 def test_static_array_constant_too_few_values():
     code_py = """