diff --git a/lib/compiler/aro/assembly_backend/x86_64.zig b/lib/compiler/aro/assembly_backend/x86_64.zig
index ff106e9d8b..247c5bf186 100644
--- a/lib/compiler/aro/assembly_backend/x86_64.zig
+++ b/lib/compiler/aro/assembly_backend/x86_64.zig
@@ -58,7 +58,7 @@ fn serializeFloat(comptime T: type, value: T, w: *std.Io.Writer) !void {
         },
         else => {
             const size = @bitSizeOf(T);
-            const storage_unit = std.meta.intToEnum(StorageUnit, size) catch unreachable;
+            const storage_unit = std.enums.fromInt(StorageUnit, size).?;
             const IntTy = @Int(.unsigned, size);
             const int_val: IntTy = @bitCast(value);
             return serializeInt(int_val, storage_unit, w);
@@ -95,7 +95,7 @@ fn emitSingleValue(c: *AsmCodeGen, qt: QualType, node: Node.Index) !void {
     if (!scalar_kind.isReal()) {
         return c.todo("Codegen _Complex values", node.tok(c.tree));
     } else if (scalar_kind.isInt()) {
-        const storage_unit = std.meta.intToEnum(StorageUnit, bit_size) catch return c.todo("Codegen _BitInt values", node.tok(c.tree));
+        const storage_unit = std.enums.fromInt(StorageUnit, bit_size) orelse return c.todo("Codegen _BitInt values", node.tok(c.tree));
         try c.data.print("  .{s} ", .{@tagName(storage_unit)});
         _ = try value.print(qt, c.comp, c.data);
         try c.data.writeByte('\n');
diff --git a/lib/docs/wasm/markdown.zig b/lib/docs/wasm/markdown.zig
index 6e9b7a0603..a15af8869c 100644
--- a/lib/docs/wasm/markdown.zig
+++ b/lib/docs/wasm/markdown.zig
@@ -149,7 +149,7 @@ fn mainImpl() !void {
     var stdin_reader = std.fs.File.stdin().reader(&stdin_buffer);
 
     while (stdin_reader.takeDelimiterExclusive('\n')) |line| {
-        const trimmed = std.mem.trimRight(u8, line, '\r');
+        const trimmed = std.mem.trimEnd(u8, line, '\r');
         try parser.feedLine(trimmed);
     } else |err| switch (err) {
         error.EndOfStream => {},
diff --git a/lib/std/Build/Step/Compile.zig b/lib/std/Build/Step/Compile.zig
index 4f9900ab59..7be41ebbea 100644
--- a/lib/std/Build/Step/Compile.zig
+++ b/lib/std/Build/Step/Compile.zig
@@ -188,9 +188,6 @@ force_undefined_symbols: std.StringHashMap(void),
 /// Overrides the default stack size
 stack_size: ?u64 = null,
 
-/// Deprecated; prefer using `lto`.
-want_lto: ?bool = null,
-
 use_llvm: ?bool,
 use_lld: ?bool,
 use_new_linker: ?bool,
@@ -540,7 +537,7 @@ pub fn installHeadersDirectory(
 /// When a module links with this artifact, all headers marked for installation are added to that
 /// module's include search path.
 pub fn installConfigHeader(cs: *Compile, config_header: *Step.ConfigHeader) void {
-    cs.installHeader(config_header.getOutput(), config_header.include_path);
+    cs.installHeader(config_header.getOutputFile(), config_header.include_path);
 }
 
 /// Forwards all headers marked for installation from `lib` to this artifact.
@@ -683,18 +680,6 @@ pub fn producesImplib(compile: *Compile) bool {
     return compile.isDll();
 }
 
-/// Deprecated; use `compile.root_module.link_libc = true` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn linkLibC(compile: *Compile) void {
-    compile.root_module.link_libc = true;
-}
-
-/// Deprecated; use `compile.root_module.link_libcpp = true` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn linkLibCpp(compile: *Compile) void {
-    compile.root_module.link_libcpp = true;
-}
-
 const PkgConfigResult = struct {
     cflags: []const []const u8,
     libs: []const []const u8,
@@ -808,46 +793,6 @@ fn runPkgConfig(compile: *Compile, lib_name: []const u8) !PkgConfigResult {
     };
 }
 
-/// Deprecated; use `compile.root_module.linkSystemLibrary(name, .{})` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn linkSystemLibrary(compile: *Compile, name: []const u8) void {
-    return compile.root_module.linkSystemLibrary(name, .{});
-}
-
-/// Deprecated; use `compile.root_module.linkSystemLibrary(name, options)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn linkSystemLibrary2(
-    compile: *Compile,
-    name: []const u8,
-    options: Module.LinkSystemLibraryOptions,
-) void {
-    return compile.root_module.linkSystemLibrary(name, options);
-}
-
-/// Deprecated; use `c.root_module.linkFramework(name, .{})` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn linkFramework(c: *Compile, name: []const u8) void {
-    c.root_module.linkFramework(name, .{});
-}
-
-/// Deprecated; use `compile.root_module.addCSourceFiles(options)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addCSourceFiles(compile: *Compile, options: Module.AddCSourceFilesOptions) void {
-    compile.root_module.addCSourceFiles(options);
-}
-
-/// Deprecated; use `compile.root_module.addCSourceFile(source)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addCSourceFile(compile: *Compile, source: Module.CSourceFile) void {
-    compile.root_module.addCSourceFile(source);
-}
-
-/// Deprecated; use `compile.root_module.addWin32ResourceFile(source)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addWin32ResourceFile(compile: *Compile, source: Module.RcSourceFile) void {
-    compile.root_module.addWin32ResourceFile(source);
-}
-
 pub fn setVerboseLink(compile: *Compile, value: bool) void {
     compile.verbose_link = value;
 }
@@ -929,84 +874,6 @@ pub fn getEmittedLlvmBc(compile: *Compile) LazyPath {
     return compile.getEmittedFileGeneric(&compile.generated_llvm_bc);
 }
 
-/// Deprecated; use `compile.root_module.addAssemblyFile(source)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addAssemblyFile(compile: *Compile, source: LazyPath) void {
-    compile.root_module.addAssemblyFile(source);
-}
-
-/// Deprecated; use `compile.root_module.addObjectFile(source)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addObjectFile(compile: *Compile, source: LazyPath) void {
-    compile.root_module.addObjectFile(source);
-}
-
-/// Deprecated; use `compile.root_module.addObject(object)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addObject(compile: *Compile, object: *Compile) void {
-    compile.root_module.addObject(object);
-}
-
-/// Deprecated; use `compile.root_module.linkLibrary(library)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn linkLibrary(compile: *Compile, library: *Compile) void {
-    compile.root_module.linkLibrary(library);
-}
-
-/// Deprecated; use `compile.root_module.addAfterIncludePath(lazy_path)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addAfterIncludePath(compile: *Compile, lazy_path: LazyPath) void {
-    compile.root_module.addAfterIncludePath(lazy_path);
-}
-
-/// Deprecated; use `compile.root_module.addSystemIncludePath(lazy_path)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addSystemIncludePath(compile: *Compile, lazy_path: LazyPath) void {
-    compile.root_module.addSystemIncludePath(lazy_path);
-}
-
-/// Deprecated; use `compile.root_module.addIncludePath(lazy_path)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addIncludePath(compile: *Compile, lazy_path: LazyPath) void {
-    compile.root_module.addIncludePath(lazy_path);
-}
-
-/// Deprecated; use `compile.root_module.addConfigHeader(config_header)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addConfigHeader(compile: *Compile, config_header: *Step.ConfigHeader) void {
-    compile.root_module.addConfigHeader(config_header);
-}
-
-/// Deprecated; use `compile.root_module.addEmbedPath(lazy_path)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addEmbedPath(compile: *Compile, lazy_path: LazyPath) void {
-    compile.root_module.addEmbedPath(lazy_path);
-}
-
-/// Deprecated; use `compile.root_module.addLibraryPath(directory_path)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addLibraryPath(compile: *Compile, directory_path: LazyPath) void {
-    compile.root_module.addLibraryPath(directory_path);
-}
-
-/// Deprecated; use `compile.root_module.addRPath(directory_path)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addRPath(compile: *Compile, directory_path: LazyPath) void {
-    compile.root_module.addRPath(directory_path);
-}
-
-/// Deprecated; use `compile.root_module.addSystemFrameworkPath(directory_path)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addSystemFrameworkPath(compile: *Compile, directory_path: LazyPath) void {
-    compile.root_module.addSystemFrameworkPath(directory_path);
-}
-
-/// Deprecated; use `compile.root_module.addFrameworkPath(directory_path)` instead.
-/// To be removed after 0.15.0 is tagged.
-pub fn addFrameworkPath(compile: *Compile, directory_path: LazyPath) void {
-    compile.root_module.addFrameworkPath(directory_path);
-}
-
 pub fn setExecCmd(compile: *Compile, args: []const ?[]const u8) void {
     const b = compile.step.owner;
     assert(compile.kind == .@"test");
@@ -1763,7 +1630,7 @@ fn getZigArgs(compile: *Compile, fuzz: bool) ![][]const u8 {
             .thin => "-flto=thin",
             .none => "-fno-lto",
         });
-    } else try addFlag(&zig_args, "lto", compile.want_lto);
+    }
 
     try addFlag(&zig_args, "sanitize-coverage-trace-pc-guard", compile.sanitize_coverage_trace_pc_guard);
 
diff --git a/lib/std/Build/Step/ConfigHeader.zig b/lib/std/Build/Step/ConfigHeader.zig
index 3f89bf8ec9..8c0d3032da 100644
--- a/lib/std/Build/Step/ConfigHeader.zig
+++ b/lib/std/Build/Step/ConfigHeader.zig
@@ -124,9 +124,6 @@ pub fn getOutputFile(ch: *ConfigHeader) std.Build.LazyPath {
     return ch.getOutputDir().path(ch.step.owner, ch.include_path);
 }
 
-/// Deprecated; use `getOutputFile`.
-pub const getOutput = getOutputFile;
-
 fn addValueInner(config_header: *ConfigHeader, name: []const u8, comptime T: type, value: T) !void {
     switch (@typeInfo(T)) {
         .null => {
diff --git a/lib/std/Build/Step/Run.zig b/lib/std/Build/Step/Run.zig
index 764d2830ff..ff65aa42a7 100644
--- a/lib/std/Build/Step/Run.zig
+++ b/lib/std/Build/Step/Run.zig
@@ -88,9 +88,6 @@ skip_foreign_checks: bool,
 /// external executor (such as qemu) but not fail if the executor is unavailable.
 failing_to_execute_foreign_is_an_error: bool,
 
-/// Deprecated in favor of `stdio_limit`.
-max_stdio_size: usize,
-
 /// If stderr or stdout exceeds this amount, the child process is killed and
 /// the step fails.
 stdio_limit: std.Io.Limit,
@@ -223,7 +220,6 @@ pub fn create(owner: *std.Build, name: []const u8) *Run {
         .rename_step_with_output_arg = true,
         .skip_foreign_checks = false,
         .failing_to_execute_foreign_is_an_error = true,
-        .max_stdio_size = 10 * 1024 * 1024,
         .stdio_limit = .unlimited,
         .captured_stdout = null,
         .captured_stderr = null,
@@ -2217,7 +2213,6 @@ fn evalGeneric(run: *Run, child: *std.process.Child) !EvalGenericResult {
     var stdout_bytes: ?[]const u8 = null;
     var stderr_bytes: ?[]const u8 = null;
 
-    run.stdio_limit = run.stdio_limit.min(.limited(run.max_stdio_size));
     if (child.stdout) |stdout| {
         if (child.stderr) |stderr| {
             var poller = std.Io.poll(arena, enum { stdout, stderr }, .{
diff --git a/lib/std/Io/Reader.zig b/lib/std/Io/Reader.zig
index 78963dcdab..591d7d71b4 100644
--- a/lib/std/Io/Reader.zig
+++ b/lib/std/Io/Reader.zig
@@ -1252,7 +1252,7 @@ pub const TakeEnumError = Error || error{InvalidEnumTag};
 pub fn takeEnum(r: *Reader, comptime Enum: type, endian: std.builtin.Endian) TakeEnumError!Enum {
     const Tag = @typeInfo(Enum).@"enum".tag_type;
     const int = try r.takeInt(Tag, endian);
-    return std.meta.intToEnum(Enum, int);
+    return std.enums.fromInt(Enum, int) orelse return error.InvalidEnumTag;
 }
 
 /// Reads an integer with the same size as the given nonexhaustive enum's tag type.
diff --git a/lib/std/Io/Writer.zig b/lib/std/Io/Writer.zig
index 1b80b5b4f7..f49ef8eb67 100644
--- a/lib/std/Io/Writer.zig
+++ b/lib/std/Io/Writer.zig
@@ -1211,10 +1211,6 @@ pub fn printValue(
     }
 
     const is_any = comptime std.mem.eql(u8, fmt, ANY);
-    if (!is_any and std.meta.hasMethod(T, "format") and fmt.len == 0) {
-        // after 0.15.0 is tagged, delete this compile error and its condition
-        @compileError("ambiguous format string; specify {f} to call format method, or {any} to skip it");
-    }
 
     switch (@typeInfo(T)) {
         .float, .comptime_float => {
@@ -1702,7 +1698,7 @@ pub fn printFloatHex(w: *Writer, value: anytype, case: std.fmt.Case, opt_precisi
 
     try w.writeAll("0x");
     try w.writeByte(buf[0]);
-    const trimmed = std.mem.trimRight(u8, buf[1..], "0");
+    const trimmed = std.mem.trimEnd(u8, buf[1..], "0");
     if (opt_precision) |precision| {
         if (precision > 0) try w.writeAll(".");
     } else if (trimmed.len > 0) {
diff --git a/lib/std/Io/tty.zig b/lib/std/Io/tty.zig
index 4f5ec8fd2d..3e2bb0969d 100644
--- a/lib/std/Io/tty.zig
+++ b/lib/std/Io/tty.zig
@@ -5,11 +5,6 @@ const process = std.process;
 const windows = std.os.windows;
 const native_os = builtin.os.tag;
 
-/// Deprecated in favor of `Config.detect`.
-pub fn detectConfig(file: File) Config {
-    return .detect(file);
-}
-
 pub const Color = enum {
     black,
     red,
diff --git a/lib/std/crypto/tls/Client.zig b/lib/std/crypto/tls/Client.zig
index f6e334af8e..d3a06819bf 100644
--- a/lib/std/crypto/tls/Client.zig
+++ b/lib/std/crypto/tls/Client.zig
@@ -1158,7 +1158,7 @@ fn readIndirect(c: *Client) Reader.Error!usize {
                 P.AEAD.decrypt(cleartext, ciphertext, auth_tag, ad, nonce, pv.server_key) catch
                     return failRead(c, error.TlsBadRecordMac);
                 // TODO use scalar, non-slice version
-                const msg = mem.trimRight(u8, cleartext, "\x00");
+                const msg = mem.trimEnd(u8, cleartext, "\x00");
                 break :cleartext .{ msg.len - 1, @enumFromInt(msg[msg.len - 1]) };
             },
             .tls_1_2 => {
diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index 29c0731f4e..97c2c9055c 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -329,16 +329,16 @@ pub fn dumpHex(bytes: []const u8) void {
 }
 
 /// Prints a hexadecimal view of the bytes, returning any error that occurs.
-pub fn dumpHexFallible(bw: *Writer, ttyconf: tty.Config, bytes: []const u8) !void {
+pub fn dumpHexFallible(bw: *Writer, tty_config: tty.Config, bytes: []const u8) !void {
     var chunks = mem.window(u8, bytes, 16, 16);
     while (chunks.next()) |window| {
         // 1. Print the address.
         const address = (@intFromPtr(bytes.ptr) + 0x10 * (std.math.divCeil(usize, chunks.index orelse bytes.len, 16) catch unreachable)) - 0x10;
-        try ttyconf.setColor(bw, .dim);
+        try tty_config.setColor(bw, .dim);
         // We print the address in lowercase and the bytes in uppercase hexadecimal to distinguish them more.
         // Also, make sure all lines are aligned by padding the address.
         try bw.print("{x:0>[1]}  ", .{ address, @sizeOf(usize) * 2 });
-        try ttyconf.setColor(bw, .reset);
+        try tty_config.setColor(bw, .reset);
 
         // 2. Print the bytes.
         for (window, 0..) |byte, index| {
@@ -358,7 +358,7 @@ pub fn dumpHexFallible(bw: *Writer, ttyconf: tty.Config, bytes: []const u8) !voi
                 try bw.writeByte(byte);
             } else {
                 // Related: https://github.com/ziglang/zig/issues/7600
-                if (ttyconf == .windows_api) {
+                if (tty_config == .windows_api) {
                     try bw.writeByte('.');
                     continue;
                 }
diff --git a/lib/std/enums.zig b/lib/std/enums.zig
index ffc678d772..2b7bdade00 100644
--- a/lib/std/enums.zig
+++ b/lib/std/enums.zig
@@ -202,48 +202,6 @@ test "directEnumArrayDefault slice" {
     try testing.expectEqualSlices(u8, "default", array[2]);
 }
 
-/// Deprecated: Use @field(E, @tagName(tag)) or @field(E, string)
-pub fn nameCast(comptime E: type, comptime value: anytype) E {
-    return comptime blk: {
-        const V = @TypeOf(value);
-        if (V == E) break :blk value;
-        const name: ?[]const u8 = switch (@typeInfo(V)) {
-            .enum_literal, .@"enum" => @tagName(value),
-            .pointer => value,
-            else => null,
-        };
-        if (name) |n| {
-            if (@hasField(E, n)) {
-                break :blk @field(E, n);
-            }
-            @compileError("Enum " ++ @typeName(E) ++ " has no field named " ++ n);
-        }
-        @compileError("Cannot cast from " ++ @typeName(@TypeOf(value)) ++ " to " ++ @typeName(E));
-    };
-}
-
-test nameCast {
-    const A = enum(u1) { a = 0, b = 1 };
-    const B = enum(u1) { a = 1, b = 0 };
-    try testing.expectEqual(A.a, nameCast(A, .a));
-    try testing.expectEqual(A.a, nameCast(A, A.a));
-    try testing.expectEqual(A.a, nameCast(A, B.a));
-    try testing.expectEqual(A.a, nameCast(A, "a"));
-    try testing.expectEqual(A.a, nameCast(A, @as(*const [1]u8, "a")));
-    try testing.expectEqual(A.a, nameCast(A, @as([:0]const u8, "a")));
-    try testing.expectEqual(A.a, nameCast(A, @as([]const u8, "a")));
-
-    try testing.expectEqual(B.a, nameCast(B, .a));
-    try testing.expectEqual(B.a, nameCast(B, A.a));
-    try testing.expectEqual(B.a, nameCast(B, B.a));
-    try testing.expectEqual(B.a, nameCast(B, "a"));
-
-    try testing.expectEqual(B.b, nameCast(B, .b));
-    try testing.expectEqual(B.b, nameCast(B, A.b));
-    try testing.expectEqual(B.b, nameCast(B, B.b));
-    try testing.expectEqual(B.b, nameCast(B, "b"));
-}
-
 test fromInt {
     const E1 = enum {
         A,
diff --git a/lib/std/heap/debug_allocator.zig b/lib/std/heap/debug_allocator.zig
index 4480009781..3183becd82 100644
--- a/lib/std/heap/debug_allocator.zig
+++ b/lib/std/heap/debug_allocator.zig
@@ -460,7 +460,7 @@ pub fn DebugAllocator(comptime config: Config) type {
         pub fn detectLeaks(self: *Self) usize {
             var leaks: usize = 0;
 
-            const tty_config = std.Io.tty.detectConfig(.stderr());
+            const tty_config: std.Io.tty.Config = .detect(.stderr());
 
             for (self.buckets, 0..) |init_optional_bucket, size_class_index| {
                 var optional_bucket = init_optional_bucket;
@@ -536,7 +536,7 @@ pub fn DebugAllocator(comptime config: Config) type {
         fn reportDoubleFree(ret_addr: usize, alloc_stack_trace: StackTrace, free_stack_trace: StackTrace) void {
             var addr_buf: [stack_n]usize = undefined;
             const second_free_stack_trace = std.debug.captureCurrentStackTrace(.{ .first_address = ret_addr }, &addr_buf);
-            const tty_config = std.Io.tty.detectConfig(.stderr());
+            const tty_config: std.Io.tty.Config = .detect(.stderr());
             log.err("Double free detected. Allocation: {f} First free: {f} Second free: {f}", .{
                 std.debug.FormatStackTrace{
                     .stack_trace = alloc_stack_trace,
@@ -590,7 +590,7 @@ pub fn DebugAllocator(comptime config: Config) type {
             if (config.safety and old_mem.len != entry.value_ptr.bytes.len) {
                 var addr_buf: [stack_n]usize = undefined;
                 const free_stack_trace = std.debug.captureCurrentStackTrace(.{ .first_address = ret_addr }, &addr_buf);
-                const tty_config = std.Io.tty.detectConfig(.stderr());
+                const tty_config: std.Io.tty.Config = .detect(.stderr());
                 log.err("Allocation size {d} bytes does not match free size {d}. Allocation: {f} Free: {f}", .{
                     entry.value_ptr.bytes.len,
                     old_mem.len,
@@ -703,7 +703,7 @@ pub fn DebugAllocator(comptime config: Config) type {
             if (config.safety and old_mem.len != entry.value_ptr.bytes.len) {
                 var addr_buf: [stack_n]usize = undefined;
                 const free_stack_trace = std.debug.captureCurrentStackTrace(.{ .first_address = ret_addr }, &addr_buf);
-                const tty_config = std.Io.tty.detectConfig(.stderr());
+                const tty_config: std.Io.tty.Config = .detect(.stderr());
                 log.err("Allocation size {d} bytes does not match free size {d}. Allocation: {f} Free: {f}", .{
                     entry.value_ptr.bytes.len,
                     old_mem.len,
@@ -935,7 +935,7 @@ pub fn DebugAllocator(comptime config: Config) type {
                     var addr_buf: [stack_n]usize = undefined;
                     const free_stack_trace = std.debug.captureCurrentStackTrace(.{ .first_address = return_address }, &addr_buf);
                     if (old_memory.len != requested_size) {
-                        const tty_config = std.Io.tty.detectConfig(.stderr());
+                        const tty_config: std.Io.tty.Config = .detect(.stderr());
                         log.err("Allocation size {d} bytes does not match free size {d}. Allocation: {f} Free: {f}", .{
                             requested_size,
                             old_memory.len,
@@ -950,7 +950,7 @@ pub fn DebugAllocator(comptime config: Config) type {
                         });
                     }
                     if (alignment != slot_alignment) {
-                        const tty_config = std.Io.tty.detectConfig(.stderr());
+                        const tty_config: std.Io.tty.Config = .detect(.stderr());
                         log.err("Allocation alignment {d} does not match free alignment {d}. Allocation: {f} Free: {f}", .{
                             slot_alignment.toByteUnits(),
                             alignment.toByteUnits(),
@@ -1044,7 +1044,7 @@ pub fn DebugAllocator(comptime config: Config) type {
                 var addr_buf: [stack_n]usize = undefined;
                 const free_stack_trace = std.debug.captureCurrentStackTrace(.{ .first_address = return_address }, &addr_buf);
                 if (memory.len != requested_size) {
-                    const tty_config = std.Io.tty.detectConfig(.stderr());
+                    const tty_config: std.Io.tty.Config = .detect(.stderr());
                     log.err("Allocation size {d} bytes does not match free size {d}. Allocation: {f} Free: {f}", .{
                         requested_size,
                         memory.len,
@@ -1059,7 +1059,7 @@ pub fn DebugAllocator(comptime config: Config) type {
                     });
                 }
                 if (alignment != slot_alignment) {
-                    const tty_config = std.Io.tty.detectConfig(.stderr());
+                    const tty_config: std.Io.tty.Config = .detect(.stderr());
                     log.err("Allocation alignment {d} does not match free alignment {d}. Allocation: {f} Free: {f}", .{
                         slot_alignment.toByteUnits(),
                         alignment.toByteUnits(),
diff --git a/lib/std/http/Client.zig b/lib/std/http/Client.zig
index 431f239db3..fc3b3d3e35 100644
--- a/lib/std/http/Client.zig
+++ b/lib/std/http/Client.zig
@@ -529,7 +529,7 @@ pub const Response = struct {
             };
             if (first_line[8] != ' ') return error.HttpHeadersInvalid;
             const status: http.Status = @enumFromInt(parseInt3(first_line[9..12]));
-            const reason = mem.trimLeft(u8, first_line[12..], " ");
+            const reason = mem.trimStart(u8, first_line[12..], " ");
 
             res.version = version;
             res.status = status;
diff --git a/lib/std/mem.zig b/lib/std/mem.zig
index 5c1c4f4394..54f44981d1 100644
--- a/lib/std/mem.zig
+++ b/lib/std/mem.zig
@@ -1221,9 +1221,6 @@ test trimStart {
     try testing.expectEqualSlices(u8, "foo\n ", trimStart(u8, " foo\n ", " \n"));
 }
 
-/// Deprecated: use `trimStart` instead.
-pub const trimLeft = trimStart;
-
 /// Remove a set of values from the end of a slice.
 pub fn trimEnd(comptime T: type, slice: []const T, values_to_strip: []const T) []const T {
     var end: usize = slice.len;
@@ -1235,9 +1232,6 @@ test trimEnd {
     try testing.expectEqualSlices(u8, " foo", trimEnd(u8, " foo\n ", " \n"));
 }
 
-/// Deprecated: use `trimEnd` instead.
-pub const trimRight = trimEnd;
-
 /// Remove a set of values from the beginning and end of a slice.
 pub fn trim(comptime T: type, slice: []const T, values_to_strip: []const T) []const T {
     var begin: usize = 0;
diff --git a/lib/std/meta.zig b/lib/std/meta.zig
index 77e288ecaa..677e359b34 100644
--- a/lib/std/meta.zig
+++ b/lib/std/meta.zig
@@ -614,38 +614,6 @@ test activeTag {
     try testing.expect(activeTag(u) == UE.Float);
 }
 
-/// Deprecated: Use @FieldType(U, tag_name)
-const TagPayloadType = TagPayload;
-
-/// Deprecated: Use @FieldType(U, tag_name)
-pub fn TagPayloadByName(comptime U: type, comptime tag_name: []const u8) type {
-    const info = @typeInfo(U).@"union";
-
-    inline for (info.fields) |field_info| {
-        if (comptime mem.eql(u8, field_info.name, tag_name))
-            return field_info.type;
-    }
-
-    @compileError("no field '" ++ tag_name ++ "' in union '" ++ @typeName(U) ++ "'");
-}
-
-/// Deprecated: Use @FieldType(U, @tagName(tag))
-pub fn TagPayload(comptime U: type, comptime tag: Tag(U)) type {
-    return TagPayloadByName(U, @tagName(tag));
-}
-
-test TagPayload {
-    const Event = union(enum) {
-        Moved: struct {
-            from: i32,
-            to: i32,
-        },
-    };
-    const MovedEvent = TagPayload(Event, Event.Moved);
-    const e: Event = .{ .Moved = undefined };
-    try testing.expect(MovedEvent == @TypeOf(e.Moved));
-}
-
 /// Compares two of any type for equality. Containers that do not support comparison
 /// on their own are compared on a field-by-field basis. Pointers are not followed.
 pub fn eql(a: anytype, b: @TypeOf(a)) bool {
@@ -774,14 +742,6 @@ test eql {
     try testing.expect(!eql(v1, v3));
 }
 
-/// Deprecated: use `std.enums.fromInt` instead and handle null.
-pub const IntToEnumError = error{InvalidEnumTag};
-
-/// Deprecated: use `std.enums.fromInt` instead and handle null instead of an error.
-pub fn intToEnum(comptime EnumTag: type, tag_int: anytype) IntToEnumError!EnumTag {
-    return std.enums.fromInt(EnumTag, tag_int) orelse return error.InvalidEnumTag;
-}
-
 /// Given a type and a name, return the field index according to source order.
 /// Returns `null` if the field is not found.
 pub fn fieldIndex(comptime T: type, comptime name: []const u8) ?comptime_int {
diff --git a/lib/std/os/linux/test.zig b/lib/std/os/linux/test.zig
index f5533a54bd..c3ffe82d3f 100644
--- a/lib/std/os/linux/test.zig
+++ b/lib/std/os/linux/test.zig
@@ -138,23 +138,23 @@ test "sigset_t" {
     // See that none are set, then set each one, see that they're all set, then
     // remove them all, and then see that none are set.
     for (1..linux.NSIG) |i| {
-        const sig = std.meta.intToEnum(SIG, i) catch continue;
+        const sig = std.enums.fromInt(SIG, i) orelse continue;
         try expectEqual(false, linux.sigismember(&sigset, sig));
     }
     for (1..linux.NSIG) |i| {
-        const sig = std.meta.intToEnum(SIG, i) catch continue;
+        const sig = std.enums.fromInt(SIG, i) orelse continue;
         linux.sigaddset(&sigset, sig);
     }
     for (1..linux.NSIG) |i| {
-        const sig = std.meta.intToEnum(SIG, i) catch continue;
+        const sig = std.enums.fromInt(SIG, i) orelse continue;
         try expectEqual(true, linux.sigismember(&sigset, sig));
     }
     for (1..linux.NSIG) |i| {
-        const sig = std.meta.intToEnum(SIG, i) catch continue;
+        const sig = std.enums.fromInt(SIG, i) orelse continue;
         linux.sigdelset(&sigset, sig);
     }
     for (1..linux.NSIG) |i| {
-        const sig = std.meta.intToEnum(SIG, i) catch continue;
+        const sig = std.enums.fromInt(SIG, i) orelse continue;
         try expectEqual(false, linux.sigismember(&sigset, sig));
     }
 }
@@ -163,7 +163,7 @@ test "sigfillset" {
     // unlike the C library, all the signals are set in the kernel-level fillset
     const sigset = linux.sigfillset();
     for (1..linux.NSIG) |i| {
-        const sig = std.meta.intToEnum(linux.SIG, i) catch continue;
+        const sig = std.enums.fromInt(linux.SIG, i) orelse continue;
         try expectEqual(true, linux.sigismember(&sigset, sig));
     }
 }
@@ -171,7 +171,7 @@ test "sigfillset" {
 test "sigemptyset" {
     const sigset = linux.sigemptyset();
     for (1..linux.NSIG) |i| {
-        const sig = std.meta.intToEnum(linux.SIG, i) catch continue;
+        const sig = std.enums.fromInt(linux.SIG, i) orelse continue;
         try expectEqual(false, linux.sigismember(&sigset, sig));
     }
 }
diff --git a/lib/std/os/uefi/protocol/ip6_config.zig b/lib/std/os/uefi/protocol/ip6_config.zig
index bb660a3b8e..0ada2a7899 100644
--- a/lib/std/os/uefi/protocol/ip6_config.zig
+++ b/lib/std/os/uefi/protocol/ip6_config.zig
@@ -44,7 +44,7 @@ pub const Ip6Config = extern struct {
     pub fn setData(
         self: *const Ip6Config,
         comptime data_type: std.meta.Tag(DataType),
-        payload: *const std.meta.TagPayload(DataType, data_type),
+        payload: *const @FieldType(DataType, @tagName(data_type)),
     ) SetDataError!void {
         const data_size = @sizeOf(@TypeOf(payload));
         switch (self._set_data(self, data_type, data_size, @ptrCast(payload))) {
@@ -64,8 +64,8 @@ pub const Ip6Config = extern struct {
     pub fn getData(
         self: *const Ip6Config,
         comptime data_type: std.meta.Tag(DataType),
-    ) GetDataError!std.meta.TagPayload(DataType, data_type) {
-        const DataPayload = std.meta.TagPayload(DataType, data_type);
+    ) GetDataError!@FieldType(DataType, @tagName(data_type)) {
+        const DataPayload = @FieldType(DataType, @tagName(data_type));
 
         var payload: DataPayload = undefined;
         var payload_size: usize = @sizeOf(DataPayload);
diff --git a/lib/std/posix/test.zig b/lib/std/posix/test.zig
index aaaaa1d948..c9c41dd042 100644
--- a/lib/std/posix/test.zig
+++ b/lib/std/posix/test.zig
@@ -536,7 +536,7 @@ test "sigset empty/full" {
 
     var set: posix.sigset_t = posix.sigemptyset();
     for (1..posix.NSIG) |i| {
-        const sig = std.meta.intToEnum(posix.SIG, i) catch continue;
+        const sig = std.enums.fromInt(posix.SIG, i) orelse continue;
         try expectEqual(false, posix.sigismember(&set, sig));
     }
 
@@ -565,29 +565,29 @@ test "sigset add/del" {
     // See that none are set, then set each one, see that they're all set, then
     // remove them all, and then see that none are set.
     for (1..posix.NSIG) |i| {
-        const sig = std.meta.intToEnum(posix.SIG, i) catch continue;
+        const sig = std.enums.fromInt(posix.SIG, i) orelse continue;
         try expectEqual(false, posix.sigismember(&sigset, sig));
     }
     for (1..posix.NSIG) |i| {
         if (!reserved_signo(i)) {
-            const sig = std.meta.intToEnum(posix.SIG, i) catch continue;
+            const sig = std.enums.fromInt(posix.SIG, i) orelse continue;
             posix.sigaddset(&sigset, sig);
         }
     }
     for (1..posix.NSIG) |i| {
         if (!reserved_signo(i)) {
-            const sig = std.meta.intToEnum(posix.SIG, i) catch continue;
+            const sig = std.enums.fromInt(posix.SIG, i) orelse continue;
             try expectEqual(true, posix.sigismember(&sigset, sig));
         }
     }
     for (1..posix.NSIG) |i| {
         if (!reserved_signo(i)) {
-            const sig = std.meta.intToEnum(posix.SIG, i) catch continue;
+            const sig = std.enums.fromInt(posix.SIG, i) orelse continue;
             posix.sigdelset(&sigset, sig);
         }
     }
     for (1..posix.NSIG) |i| {
-        const sig = std.meta.intToEnum(posix.SIG, i) catch continue;
+        const sig = std.enums.fromInt(posix.SIG, i) orelse continue;
         try expectEqual(false, posix.sigismember(&sigset, sig));
     }
 }
diff --git a/lib/std/testing.zig b/lib/std/testing.zig
index d12ac3bf21..2aa282d110 100644
--- a/lib/std/testing.zig
+++ b/lib/std/testing.zig
@@ -1160,7 +1160,7 @@ pub fn checkAllAllocationFailures(backing_allocator: std.mem.Allocator, comptime
         } else |err| switch (err) {
             error.OutOfMemory => {
                 if (failing_allocator_inst.allocated_bytes != failing_allocator_inst.freed_bytes) {
-                    const tty_config = std.Io.tty.detectConfig(.stderr());
+                    const tty_config: std.Io.tty.Config = .detect(.stderr());
                     print(
                         "\nfail_index: {d}/{d}\nallocated bytes: {d}\nfreed bytes: {d}\nallocations: {d}\ndeallocations: {d}\nallocation that was made to fail: {f}",
                         .{
diff --git a/test/standalone/config_header/build.zig b/test/standalone/config_header/build.zig
index 3432685fce..733a396907 100644
--- a/test/standalone/config_header/build.zig
+++ b/test/standalone/config_header/build.zig
@@ -21,7 +21,7 @@ pub fn build(b: *std.Build) void {
         },
     );
 
-    const check_config_header = b.addCheckFile(config_header.getOutput(), .{ .expected_exact = @embedFile("config.h") });
+    const check_config_header = b.addCheckFile(config_header.getOutputFile(), .{ .expected_exact = @embedFile("config.h") });
 
     const test_step = b.step("test", "Test it");
     test_step.dependOn(&check_config_header.step);
diff --git a/test/standalone/test_obj_link_run/build.zig b/test/standalone/test_obj_link_run/build.zig
index 19d52ce68c..24e0e961e7 100644
--- a/test/standalone/test_obj_link_run/build.zig
+++ b/test/standalone/test_obj_link_run/build.zig
@@ -9,9 +9,9 @@ pub fn build(b: *std.Build) void {
         }),
     });
     if (is_windows) {
-        test_obj.linkSystemLibrary("ntdll");
-        test_obj.linkSystemLibrary("kernel32");
-        test_obj.linkSystemLibrary("ws2_32");
+        test_obj.root_module.linkSystemLibrary("ntdll", .{});
+        test_obj.root_module.linkSystemLibrary("kernel32", .{});
+        test_obj.root_module.linkSystemLibrary("ws2_32", .{});
     }
 
     const test_exe_mod = b.createModule(.{