diff --git a/src/transformation/visitors/access.ts b/src/transformation/visitors/access.ts
index f0eced595..12e9385ad 100644
--- a/src/transformation/visitors/access.ts
+++ b/src/transformation/visitors/access.ts
@@ -3,12 +3,18 @@ import * as lua from "../../LuaAST";
 import { transformBuiltinPropertyAccessExpression } from "../builtins";
 import { FunctionVisitor, TransformationContext } from "../context";
 import { AnnotationKind, getTypeAnnotations } from "../utils/annotations";
-import { invalidMultiReturnAccess, unsupportedOptionalCompileMembersOnly } from "../utils/diagnostics";
+import {
+    invalidCallExtensionUse,
+    invalidMultiReturnAccess,
+    unsupportedOptionalCompileMembersOnly,
+} from "../utils/diagnostics";
+import { getExtensionKindForNode } from "../utils/language-extensions";
 import { addToNumericExpression } from "../utils/lua-ast";
 import { LuaLibFeature, transformLuaLibFunction } from "../utils/lualib";
 import { isArrayType, isNumberType, isStringType } from "../utils/typescript";
 import { tryGetConstEnumValue } from "./enum";
 import { transformOrderedExpressions } from "./expression-list";
+import { callExtensions } from "./language-extensions/call-extension";
 import { isMultiReturnCall, returnsMultiType } from "./language-extensions/multi";
 import {
     transformOptionalChainWithCapture,
@@ -143,6 +149,18 @@ export function transformPropertyAccessExpressionWithCapture(
         return { expression: builtinResult };
     }
 
+    if (
+        ts.isIdentifier(node.expression) &&
+        node.parent &&
+        (!ts.isCallExpression(node.parent) || node.parent.expression !== node)
+    ) {
+        // Check if this is a method call extension that is not used as a call
+        const extensionType = getExtensionKindForNode(context, node);
+        if (extensionType && callExtensions.has(extensionType)) {
+            context.diagnostics.push(invalidCallExtensionUse(node));
+        }
+    }
+
     const table = context.transformExpression(node.expression);
 
     if (thisValueCapture) {
diff --git a/src/transformation/visitors/identifier.ts b/src/transformation/visitors/identifier.ts
index efb5349bc..78f2bb8c2 100644
--- a/src/transformation/visitors/identifier.ts
+++ b/src/transformation/visitors/identifier.ts
@@ -31,7 +31,10 @@ function transformNonValueIdentifier(
 
     if (extensionKind) {
         if (callExtensions.has(extensionKind)) {
-            context.diagnostics.push(invalidCallExtensionUse(identifier));
+            // Avoid putting duplicate diagnostic on the name of a variable declaration, due to the inferred type
+            if (!(ts.isVariableDeclaration(identifier.parent) && identifier.parent.name === identifier)) {
+                context.diagnostics.push(invalidCallExtensionUse(identifier));
+            }
             // fall through
         } else if (isIdentifierExtensionValue(symbol, extensionKind)) {
             reportInvalidExtensionValue(context, identifier, extensionKind);
diff --git a/test/setup.ts b/test/setup.ts
index de78ad24b..e468c5ab8 100644
--- a/test/setup.ts
+++ b/test/setup.ts
@@ -37,7 +37,9 @@ expect.extend({
                 const message = this.isNot
                     ? diagnosticMessages
                     : expected
-                    ? `Expected:\n${expected.join("\n")}\nReceived:\n${diagnostics.map(diag => diag.code).join("\n")}\n`
+                    ? `Expected:\n${expected.join("\n")}\nReceived:\n${diagnostics
+                          .map(diag => diag.code)
+                          .join("\n")}\n\n${diagnosticMessages}\n`
                     : `Received: ${this.utils.printReceived([])}\n`;
 
                 return matcherHint + "\n\n" + message;
diff --git a/test/unit/language-extensions/__snapshots__/table.spec.ts.snap b/test/unit/language-extensions/__snapshots__/table.spec.ts.snap
index 831d1ec54..9821d9777 100644
--- a/test/unit/language-extensions/__snapshots__/table.spec.ts.snap
+++ b/test/unit/language-extensions/__snapshots__/table.spec.ts.snap
@@ -85,3 +85,51 @@ exports[`LuaTableHas extension invalid use ("const foo: unknown = tableHas;"): d
 exports[`LuaTableHas extension invalid use ("declare function foo(tableHas: LuaTableHas<{}, string>): void; foo(tableHas);"): code 1`] = `"foo(_G, tableHas)"`;
 
 exports[`LuaTableHas extension invalid use ("declare function foo(tableHas: LuaTableHas<{}, string>): void; foo(tableHas);"): diagnostics 1`] = `"main.ts(3,80): error TSTL: This function must be called directly and cannot be referred to."`;
+
+exports[`LuaTableHas extension invalid use method assignment ("LuaMap<string, number>"): code 1`] = `
+"____table = {}
+has = ____table.has"
+`;
+
+exports[`LuaTableHas extension invalid use method assignment ("LuaMap<string, number>"): diagnostics 1`] = `"main.ts(3,29): error TSTL: This function must be called directly and cannot be referred to."`;
+
+exports[`LuaTableHas extension invalid use method assignment ("LuaSet<string>"): code 1`] = `
+"____table = {}
+has = ____table.has"
+`;
+
+exports[`LuaTableHas extension invalid use method assignment ("LuaSet<string>"): diagnostics 1`] = `"main.ts(3,29): error TSTL: This function must be called directly and cannot be referred to."`;
+
+exports[`LuaTableHas extension invalid use method assignment ("LuaTable<string, number>"): code 1`] = `
+"____table = {}
+has = ____table.has"
+`;
+
+exports[`LuaTableHas extension invalid use method assignment ("LuaTable<string, number>"): diagnostics 1`] = `"main.ts(3,29): error TSTL: This function must be called directly and cannot be referred to."`;
+
+exports[`LuaTableHas extension invalid use method expression ("LuaMap<string, number>"): code 1`] = `
+"local ____lualib = require(\\"lualib_bundle\\")
+local __TS__ArrayMap = ____lualib.__TS__ArrayMap
+____table = {}
+__TS__ArrayMap({\\"a\\", \\"b\\", \\"c\\"}, ____table.has)"
+`;
+
+exports[`LuaTableHas extension invalid use method expression ("LuaMap<string, number>"): diagnostics 1`] = `"main.ts(3,37): error TSTL: This function must be called directly and cannot be referred to."`;
+
+exports[`LuaTableHas extension invalid use method expression ("LuaSet<string>"): code 1`] = `
+"local ____lualib = require(\\"lualib_bundle\\")
+local __TS__ArrayMap = ____lualib.__TS__ArrayMap
+____table = {}
+__TS__ArrayMap({\\"a\\", \\"b\\", \\"c\\"}, ____table.has)"
+`;
+
+exports[`LuaTableHas extension invalid use method expression ("LuaSet<string>"): diagnostics 1`] = `"main.ts(3,37): error TSTL: This function must be called directly and cannot be referred to."`;
+
+exports[`LuaTableHas extension invalid use method expression ("LuaTable<string, number>"): code 1`] = `
+"local ____lualib = require(\\"lualib_bundle\\")
+local __TS__ArrayMap = ____lualib.__TS__ArrayMap
+____table = {}
+__TS__ArrayMap({\\"a\\", \\"b\\", \\"c\\"}, ____table.has)"
+`;
+
+exports[`LuaTableHas extension invalid use method expression ("LuaTable<string, number>"): diagnostics 1`] = `"main.ts(3,37): error TSTL: This function must be called directly and cannot be referred to."`;
diff --git a/test/unit/language-extensions/table.spec.ts b/test/unit/language-extensions/table.spec.ts
index 8f21dc8d1..ed9e8e37c 100644
--- a/test/unit/language-extensions/table.spec.ts
+++ b/test/unit/language-extensions/table.spec.ts
@@ -170,6 +170,30 @@ describe("LuaTableHas extension", () => {
             .withLanguageExtensions()
             .expectDiagnosticsToMatchSnapshot([invalidCallExtensionUse.code]);
     });
+
+    test.each(["LuaTable<string, number>", "LuaMap<string, number>", "LuaSet<string>"])(
+        "invalid use method assignment (%p)",
+        type => {
+            util.testModule`
+                const table = new ${type}();
+                const has = table.has;
+            `
+                .withLanguageExtensions()
+                .expectDiagnosticsToMatchSnapshot([invalidCallExtensionUse.code]);
+        }
+    );
+
+    test.each(["LuaTable<string, number>", "LuaMap<string, number>", "LuaSet<string>"])(
+        "invalid use method expression (%p)",
+        type => {
+            util.testModule`
+                const table = new ${type}();
+                ["a", "b", "c"].map(table.has);
+            `
+                .withLanguageExtensions()
+                .expectDiagnosticsToMatchSnapshot([invalidCallExtensionUse.code]);
+        }
+    );
 });
 
 describe("LuaTableDelete extension", () => {