Change:
<del> // only-x86_64 #![feature(asm_const)] use std::arch::{asm, global_asm}; fn main() { let mut foo = 0; let mut bar = 0; unsafe { asm!(); //~^ ERROR requires at least a template string argument asm!(foo); //~^ ERROR asm template must be a string literal asm!("{}" foo); //~^ ERROR expected token: `,` asm!("{}", foo); //~^ ERROR expected operand, clobber_abi, options, or additional template string asm!("{}", in foo); //~^ ERROR expected `(`, found `foo` asm!("{}", in(reg foo)); //~^ ERROR expected `)`, found `foo` asm!("{}", in(reg)); //~^ ERROR expected expression, found end of macro arguments asm!("{}", inout(=) foo => bar); //~^ ERROR expected register class or explicit register asm!("{}", inout(reg) foo =>); //~^ ERROR expected expression, found end of macro arguments asm!("{}", in(reg) foo => bar); //~^ ERROR expected one of `!`, `,`, `.`, `::`, `?`, `{`, or an operator, found `=>` asm!("{}", sym foo + bar); //~^ ERROR expected a path for argument to `sym` asm!("", options(foo)); //~^ ERROR expected one of asm!("", options(nomem foo)); //~^ ERROR expected one of asm!("", options(nomem, foo)); //~^ ERROR expected one of asm!("{}", options(), const foo); //~^ ERROR attempt to use a non-constant value in a constant asm!("", clobber_abi()); //~^ ERROR at least one abi must be provided asm!("", clobber_abi(foo)); //~^ ERROR expected string literal asm!("", clobber_abi("C" foo)); //~^ ERROR expected one of `)` or `,`, found `foo` asm!("", clobber_abi("C", foo)); //~^ ERROR expected string literal asm!("{}", clobber_abi("C"), const foo); //~^ ERROR attempt to use a non-constant value in a constant asm!("", options(), clobber_abi("C")); asm!("{}", options(), clobber_abi("C"), const foo); //~^ ERROR attempt to use a non-constant value in a constant asm!("{a}", a = const foo, a = const bar); //~^ ERROR duplicate argument named `a` //~^^ ERROR argument never used //~^^^ ERROR attempt to use a non-constant value in a constant //~^^^^ ERROR attempt to use a non-constant value in a constant asm!("", a = in("eax") foo); //~^ ERROR explicit register arguments cannot have names asm!("{a}", in("eax") foo, a = const bar); //~^ ERROR attempt to use a non-constant value in a constant asm!("{a}", in("eax") foo, a = const bar); //~^ ERROR attempt to use a non-constant value in a constant asm!("{1}", in("eax") foo, const bar); //~^ ERROR positional arguments cannot follow named arguments or explicit register arguments //~^^ ERROR attempt to use a non-constant value in a constant asm!("", options(), ""); //~^ ERROR expected one of asm!("{}", in(reg) foo, "{}", out(reg) foo); //~^ ERROR expected one of asm!(format!("{{{}}}", 0), in(reg) foo); //~^ ERROR asm template must be a string literal asm!("{1}", format!("{{{}}}", 0), in(reg) foo, out(reg) bar); //~^ ERROR asm template must be a string literal asm!("{}", in(reg) _); //~^ ERROR _ cannot be used for input operands asm!("{}", inout(reg) _); //~^ ERROR _ cannot be used for input operands asm!("{}", inlateout(reg) _); //~^ ERROR _ cannot be used for input operands } } const FOO: i32 = 1; const BAR: i32 = 2; global_asm!(); //~^ ERROR requires at least a template string argument global_asm!(FOO); //~^ ERROR asm template must be a string literal global_asm!("{}" FOO); //~^ ERROR expected token: `,` global_asm!("{}", FOO); //~^ ERROR expected operand, options, or additional template string global_asm!("{}", const); //~^ ERROR expected expression, found end of macro arguments global_asm!("{}", const(reg) FOO); //~^ ERROR expected one of global_asm!("", options(FOO)); //~^ ERROR expected one of global_asm!("", options(nomem FOO)); //~^ ERROR expected one of global_asm!("", options(nomem, FOO)); //~^ ERROR expected one of global_asm!("{}", options(), const FOO); global_asm!("", clobber_abi(FOO)); //~^ ERROR expected string literal global_asm!("", clobber_abi("C" FOO)); //~^ ERROR expected one of `)` or `,`, found `FOO` global_asm!("", clobber_abi("C", FOO)); //~^ ERROR expected string literal global_asm!("{}", clobber_abi("C"), const FOO); //~^ ERROR `clobber_abi` cannot be used with `global_asm!` global_asm!("", options(), clobber_abi("C")); //~^ ERROR `clobber_abi` cannot be used with `global_asm!` global_asm!("{}", options(), clobber_abi("C"), const FOO); //~^ ERROR `clobber_abi` cannot be used with `global_asm!` global_asm!("", clobber_abi("C"), clobber_abi("C")); //~^ ERROR `clobber_abi` cannot be used with `global_asm!` global_asm!("{a}", a = const FOO, a = const BAR); //~^ ERROR duplicate argument named `a` //~^^ ERROR argument never used global_asm!("", options(), ""); //~^ ERROR expected one of global_asm!("{}", const FOO, "{}", const FOO); //~^ ERROR expected one of global_asm!(format!("{{{}}}", 0), const FOO); //~^ ERROR asm template must be a string literal global_asm!("{1}", format!("{{{}}}", 0), const FOO, const BAR); //~^ ERROR asm template must be a string literal </del>

Discussion:
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Regressed in 1.58:
This was , whoops. I can work on this. claim