diff --git a/base/intrinsics/intrinsics.odin b/base/intrinsics/intrinsics.odin
index 952f927bd..d34519f63 100644
--- a/base/intrinsics/intrinsics.odin
+++ b/base/intrinsics/intrinsics.odin
@@ -244,6 +244,11 @@ constant_utf16_cstring :: proc($literal: string) -> [^]u16 ---
 
 constant_log2 :: proc($v: $T) -> T where type_is_integer(T) ---
 
+constant_floor :: proc($v: $T) -> T where type_is_integer(T) || type_is_float(T) ---
+constant_trunc :: proc($v: $T) -> T where type_is_integer(T) || type_is_float(T) ---
+constant_ceil  :: proc($v: $T) -> T where type_is_integer(T) || type_is_float(T) ---
+constant_round :: proc($v: $T) -> T where type_is_integer(T) || type_is_float(T) ---
+
 // SIMD related
 simd_add  :: proc(a, b: #simd[N]T) -> #simd[N]T ---
 simd_sub  :: proc(a, b: #simd[N]T) -> #simd[N]T ---
diff --git a/src/check_builtin.cpp b/src/check_builtin.cpp
index 530efb3c8..b2d28afc0 100644
--- a/src/check_builtin.cpp
+++ b/src/check_builtin.cpp
@@ -13,6 +13,7 @@ gb_global BuiltinTypeIsProc *builtin_type_is_procs[BuiltinProc__type_simple_bool
 	nullptr, // BuiltinProc__type_simple_boolean_begin
 
 	is_type_boolean,
+	is_type_bit_field,
 	is_type_integer,
 	is_type_rune,
 	is_type_float,
@@ -24,6 +25,7 @@ gb_global BuiltinTypeIsProc *builtin_type_is_procs[BuiltinProc__type_simple_bool
 	is_type_cstring16,
 	is_type_typeid,
 	is_type_any,
+
 	is_type_endian_platform,
 	is_type_endian_little,
 	is_type_endian_big,
@@ -34,8 +36,8 @@ gb_global BuiltinTypeIsProc *builtin_type_is_procs[BuiltinProc__type_simple_bool
 	is_type_indexable,
 	is_type_sliceable,
 	is_type_comparable,
-	is_type_simple_compare,
-	is_type_nearly_simple_compare,
+	is_type_simple_compare, // easily compared using memcmp
+	is_type_nearly_simple_compare, // easily compared using memcmp (including floats)
 	is_type_dereferenceable,
 	is_type_valid_for_keys,
 	is_type_valid_for_matrix_elems,
@@ -47,14 +49,12 @@ gb_global BuiltinTypeIsProc *builtin_type_is_procs[BuiltinProc__type_simple_bool
 	is_type_enumerated_array,
 	is_type_slice,
 	is_type_dynamic_array,
-
 	is_type_map,
 	is_type_struct,
 	is_type_union,
 	is_type_enum,
 	is_type_proc,
 	is_type_bit_set,
-	is_type_bit_field,
 	is_type_simd_vector,
 	is_type_matrix,
 	is_type_raw_union,
@@ -4768,6 +4768,42 @@ gb_internal bool check_builtin_procedure(CheckerContext *c, Operand *operand, As
 		break;
 	}
 
+	case BuiltinProc_constant_floor:
+	case BuiltinProc_constant_trunc:
+	case BuiltinProc_constant_ceil:
+	case BuiltinProc_constant_round:
+	{
+		Operand o = {};
+		check_expr(c, &o, ce->args[0]);
+
+		if (!is_type_integer_or_float(o.type) && (o.mode != Addressing_Constant)) {
+			error(ce->args[0], "Expected a constant number for '%.*s'", LIT(builtin_name));
+			return false;
+		}
+		operand->mode = Addressing_Constant;
+		operand->type = o.type;
+
+		ExactValue value = o.value;
+		if (value.kind == ExactValue_Integer) {
+			// do nothing
+		} else if (value.kind == ExactValue_Float) {
+			f64 f = value.value_float;
+			switch (id) {
+			case BuiltinProc_constant_floor: f = floor(f); break;
+			case BuiltinProc_constant_trunc: f = trunc(f); break;
+			case BuiltinProc_constant_ceil:  f = ceil(f);  break;
+			case BuiltinProc_constant_round: f = round(f); break;
+			default:
+				GB_PANIC("Unhandled built-in: %.*s", LIT(builtin_name));
+				break;
+			}
+			value = exact_value_float(f);
+		}
+
+		operand->value = value;
+		break;
+	}
+
 	case BuiltinProc_soa_struct: {
 		Operand x = {};
 		Operand y = {};
@@ -6552,17 +6588,18 @@ gb_internal bool check_builtin_procedure(CheckerContext *c, Operand *operand, As
 
 
 	case BuiltinProc_type_is_boolean:
+	case BuiltinProc_type_is_bit_field:
 	case BuiltinProc_type_is_integer:
 	case BuiltinProc_type_is_rune:
 	case BuiltinProc_type_is_float:
 	case BuiltinProc_type_is_complex:
 	case BuiltinProc_type_is_quaternion:
-	case BuiltinProc_type_is_typeid:
-	case BuiltinProc_type_is_any:
 	case BuiltinProc_type_is_string:
 	case BuiltinProc_type_is_string16:
 	case BuiltinProc_type_is_cstring:
 	case BuiltinProc_type_is_cstring16:
+	case BuiltinProc_type_is_typeid:
+	case BuiltinProc_type_is_any:
 	case BuiltinProc_type_is_endian_platform:
 	case BuiltinProc_type_is_endian_little:
 	case BuiltinProc_type_is_endian_big:
@@ -6573,8 +6610,8 @@ gb_internal bool check_builtin_procedure(CheckerContext *c, Operand *operand, As
 	case BuiltinProc_type_is_indexable:
 	case BuiltinProc_type_is_sliceable:
 	case BuiltinProc_type_is_comparable:
-	case BuiltinProc_type_is_simple_compare:
-	case BuiltinProc_type_is_nearly_simple_compare:
+	case BuiltinProc_type_is_simple_compare: // easily compared using memcmp
+	case BuiltinProc_type_is_nearly_simple_compare: // easily compared using memcmp (including floats)
 	case BuiltinProc_type_is_dereferenceable:
 	case BuiltinProc_type_is_valid_map_key:
 	case BuiltinProc_type_is_valid_matrix_elements:
@@ -6591,7 +6628,6 @@ gb_internal bool check_builtin_procedure(CheckerContext *c, Operand *operand, As
 	case BuiltinProc_type_is_enum:
 	case BuiltinProc_type_is_proc:
 	case BuiltinProc_type_is_bit_set:
-	case BuiltinProc_type_is_bit_field:
 	case BuiltinProc_type_is_simd_vector:
 	case BuiltinProc_type_is_matrix:
 	case BuiltinProc_type_is_raw_union:
diff --git a/src/checker_builtin_procs.hpp b/src/checker_builtin_procs.hpp
index 01502128a..663274cdc 100644
--- a/src/checker_builtin_procs.hpp
+++ b/src/checker_builtin_procs.hpp
@@ -49,6 +49,11 @@ enum BuiltinProcId {
 
 	BuiltinProc_constant_log2,
 
+	BuiltinProc_constant_floor,
+	BuiltinProc_constant_trunc,
+	BuiltinProc_constant_ceil,
+	BuiltinProc_constant_round,
+
 	BuiltinProc_transpose,
 	BuiltinProc_outer_product,
 	BuiltinProc_hadamard_product,
@@ -420,7 +425,11 @@ gb_global BuiltinProc builtin_procs[BuiltinProc_COUNT] = {
 
 	{STR_LIT("has_target_feature"), 1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 
-	{STR_LIT("constant_log2"), 1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("constant_log2"),     1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("constant_floor"),    1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("constant_trunc"),    1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("constant_ceil"),     1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("constant_round"),    1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 
 	{STR_LIT("transpose"),        1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("outer_product"),    2, false, Expr_Expr, BuiltinProcPkg_intrinsics},
@@ -615,17 +624,18 @@ gb_global BuiltinProc builtin_procs[BuiltinProc_COUNT] = {
 
 	{STR_LIT(""), 0, false, Expr_Stmt, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_boolean"),           1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("type_is_bit_field"),         1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_integer"),           1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_rune"),              1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_float"),             1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_complex"),           1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_quaternion"),        1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
-	{STR_LIT("type_is_typeid"),            1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
-	{STR_LIT("type_is_any"),               1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_string"),            1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_string16"),          1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
-	{STR_LIT("type_is_cstring"),            1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
-	{STR_LIT("type_is_cstring16"),          1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("type_is_cstring"),           1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("type_is_cstring16"),         1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("type_is_typeid"),            1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("type_is_any"),               1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 
 	{STR_LIT("type_is_endian_platform"),   1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_endian_little"),     1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
@@ -656,7 +666,6 @@ gb_global BuiltinProc builtin_procs[BuiltinProc_COUNT] = {
 	{STR_LIT("type_is_enum"),              1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_proc"),              1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_bit_set"),           1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
-	{STR_LIT("type_is_bit_field"),         1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_simd_vector"),       1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_matrix"),            1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("type_is_raw_union"),         1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
diff --git a/src/parser.cpp b/src/parser.cpp
index 94c6083f7..152e55f8b 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -2739,7 +2739,7 @@ gb_internal Ast *parse_operand(AstFile *f, bool lhs) {
 			while (allow_token(f, Token_Comma)) {
 				Ast *dummy_name = parse_ident(f);
 				if (!err_once) {
-					error(dummy_name, "'bit_field' fields do not support multiple names per field");
+					syntax_error(dummy_name, "'bit_field' fields do not support multiple names per field");
 					err_once = true;
 				}
 			}
@@ -3299,8 +3299,16 @@ gb_internal Ast *parse_atom_expr(AstFile *f, Ast *operand, bool lhs) {
 			open = expect_token(f, Token_OpenBracket);
 
 			if (f->curr_token.kind == Token_CloseBracket) {
-				error(f->curr_token, "Expected an operand, got ]");
+				ERROR_BLOCK();
+				syntax_error(f->curr_token, "Expected an operand, got ]");
 				close = expect_token(f, Token_CloseBracket);
+
+				if (f->allow_type) {
+					gbString s = expr_to_string(operand);
+					error_line("\tSuggestion: If a type was wanted, did you mean '[]%s'?", s);
+					gb_string_free(s);
+				}
+
 				operand = ast_index_expr(f, operand, nullptr, open, close);
 				break;
 			}
@@ -6594,7 +6602,7 @@ gb_internal bool parse_file_tag(const String &lc, const Token &tok, AstFile *f)
 	} else if (lc == "no-instrumentation") {
 		f->flags |= AstFile_NoInstrumentation;
 	} else {
-		error(tok, "Unknown tag '%.*s'", LIT(lc));
+		syntax_error(tok, "Unknown tag '%.*s'", LIT(lc));
 	}
 
 	return true;
diff --git a/src/types.cpp b/src/types.cpp
index bf668e5f6..a1311ba5d 100644
--- a/src/types.cpp
+++ b/src/types.cpp
@@ -1296,6 +1296,15 @@ gb_internal bool is_type_rune(Type *t) {
 	}
 	return false;
 }
+gb_internal bool is_type_integer_or_float(Type *t) {
+	t = base_type(t);
+	if (t == nullptr) { return false; }
+	if (t->kind == Type_Basic) {
+		return (t->Basic.flags & (BasicFlag_Integer|BasicFlag_Float)) != 0;
+	}
+	return false;
+}
+
 gb_internal bool is_type_numeric(Type *t) {
 	t = base_type(t);
 	if (t == nullptr) { return false; }