Change:
<del> error: requires at least a template string argument --> $DIR/parse-error.rs:11:9 | LL |         asm!(); |         ^^^^^^ error: asm template must be a string literal --> $DIR/parse-error.rs:13:14 | LL |         asm!(foo); |              ^^^ error: expected token: `,` --> $DIR/parse-error.rs:15:19 | LL |         asm!("{}" foo); |                   ^^^ expected `,` error: expected operand, clobber_abi, options, or additional template string --> $DIR/parse-error.rs:17:20 | LL |         asm!("{}", foo); |                    ^^^ expected operand, clobber_abi, options, or additional template string error: expected `(`, found `foo` --> $DIR/parse-error.rs:19:23 | LL |         asm!("{}", in foo); |                       ^^^ expected `(` error: expected `)`, found `foo` --> $DIR/parse-error.rs:21:27 | LL |         asm!("{}", in(reg foo)); |                           ^^^ expected `)` error: expected expression, found end of macro arguments --> $DIR/parse-error.rs:23:27 | LL |         asm!("{}", in(reg)); |                           ^ expected expression error: expected register class or explicit register --> $DIR/parse-error.rs:25:26 | LL |         asm!("{}", inout(=) foo => bar); |                          ^ error: expected expression, found end of macro arguments --> $DIR/parse-error.rs:27:37 | LL |         asm!("{}", inout(reg) foo =>); |                                     ^ expected expression error: expected one of `!`, `,`, `.`, `::`, `?`, `{`, or an operator, found `=>` --> $DIR/parse-error.rs:29:32 | LL |         asm!("{}", in(reg) foo => bar); |                                ^^ expected one of 7 possible tokens error: expected a path for argument to `sym` --> $DIR/parse-error.rs:31:24 | LL |         asm!("{}", sym foo + bar); |                        ^^^^^^^^^ error: expected one of `)`, `att_syntax`, `may_unwind`, `nomem`, `noreturn`, `nostack`, `preserves_flags`, `pure`, `raw`, or `readonly`, found `foo` --> $DIR/parse-error.rs:33:26 | LL |         asm!("", options(foo)); |                          ^^^ expected one of 10 possible tokens error: expected one of `)` or `,`, found `foo` --> $DIR/parse-error.rs:35:32 | LL |         asm!("", options(nomem foo)); |                                ^^^ expected one of `)` or `,` error: expected one of `)`, `att_syntax`, `may_unwind`, `nomem`, `noreturn`, `nostack`, `preserves_flags`, `pure`, `raw`, or `readonly`, found `foo` --> $DIR/parse-error.rs:37:33 | LL |         asm!("", options(nomem, foo)); |                                 ^^^ expected one of 10 possible tokens error: at least one abi must be provided as an argument to `clobber_abi` --> $DIR/parse-error.rs:41:30 | LL |         asm!("", clobber_abi()); |                              ^ error: expected string literal --> $DIR/parse-error.rs:43:30 | LL |         asm!("", clobber_abi(foo)); |                              ^^^ not a string literal error: expected one of `)` or `,`, found `foo` --> $DIR/parse-error.rs:45:34 | LL |         asm!("", clobber_abi("C" foo)); |                                  ^^^ expected one of `)` or `,` error: expected string literal --> $DIR/parse-error.rs:47:35 | LL |         asm!("", clobber_abi("C", foo)); |                                   ^^^ not a string literal error: duplicate argument named `a` --> $DIR/parse-error.rs:54:36 | LL |         asm!("{a}", a = const foo, a = const bar); |                     -------------  ^^^^^^^^^^^^^ duplicate argument |                     | |                     previously here error: argument never used --> $DIR/parse-error.rs:54:36 | LL |         asm!("{a}", a = const foo, a = const bar); |                                    ^^^^^^^^^^^^^ argument never used | = help: if this argument is intentionally unused, consider using it in an asm comment: `"/* {1} */"` error: explicit register arguments cannot have names --> $DIR/parse-error.rs:59:18 | LL |         asm!("", a = in("eax") foo); |                  ^^^^^^^^^^^^^^^^^ error: positional arguments cannot follow named arguments or explicit register arguments --> $DIR/parse-error.rs:65:36 | LL |         asm!("{1}", in("eax") foo, const bar); |                     -------------  ^^^^^^^^^ positional argument |                     | |                     explicit register argument error: expected one of `clobber_abi`, `const`, `in`, `inlateout`, `inout`, `lateout`, `options`, `out`, or `sym`, found `""` --> $DIR/parse-error.rs:68:29 | LL |         asm!("", options(), ""); |                             ^^ expected one of 9 possible tokens error: expected one of `clobber_abi`, `const`, `in`, `inlateout`, `inout`, `lateout`, `options`, `out`, or `sym`, found `"{}"` --> $DIR/parse-error.rs:70:33 | LL |         asm!("{}", in(reg) foo, "{}", out(reg) foo); |                                 ^^^^ expected one of 9 possible tokens error: asm template must be a string literal --> $DIR/parse-error.rs:72:14 | LL |         asm!(format!("{{{}}}", 0), in(reg) foo); |              ^^^^^^^^^^^^^^^^^^^^ | = note: this error originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info) error: asm template must be a string literal --> $DIR/parse-error.rs:74:21 | LL |         asm!("{1}", format!("{{{}}}", 0), in(reg) foo, out(reg) bar); |                     ^^^^^^^^^^^^^^^^^^^^ | = note: this error originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info) error: _ cannot be used for input operands --> $DIR/parse-error.rs:76:28 | LL |         asm!("{}", in(reg) _); |                            ^ error: _ cannot be used for input operands --> $DIR/parse-error.rs:78:31 | LL |         asm!("{}", inout(reg) _); |                               ^ error: _ cannot be used for input operands --> $DIR/parse-error.rs:80:35 | LL |         asm!("{}", inlateout(reg) _); |                                   ^ error: requires at least a template string argument --> $DIR/parse-error.rs:87:1 | LL | global_asm!(); | ^^^^^^^^^^^^^ error: asm template must be a string literal --> $DIR/parse-error.rs:89:13 | LL | global_asm!(FOO); |             ^^^ error: expected token: `,` --> $DIR/parse-error.rs:91:18 | LL | global_asm!("{}" FOO); |                  ^^^ expected `,` error: expected operand, options, or additional template string --> $DIR/parse-error.rs:93:19 | LL | global_asm!("{}", FOO); |                   ^^^ expected operand, options, or additional template string error: expected expression, found end of macro arguments --> $DIR/parse-error.rs:95:24 | LL | global_asm!("{}", const); |                        ^ expected expression error: expected one of `,`, `.`, `?`, or an operator, found `FOO` --> $DIR/parse-error.rs:97:30 | LL | global_asm!("{}", const(reg) FOO); |                              ^^^ expected one of `,`, `.`, `?`, or an operator error: expected one of `)`, `att_syntax`, or `raw`, found `FOO` --> $DIR/parse-error.rs:99:25 | LL | global_asm!("", options(FOO)); |                         ^^^ expected one of `)`, `att_syntax`, or `raw` error: expected one of `)`, `att_syntax`, or `raw`, found `nomem` --> $DIR/parse-error.rs:101:25 | LL | global_asm!("", options(nomem FOO)); |                         ^^^^^ expected one of `)`, `att_syntax`, or `raw` error: expected one of `)`, `att_syntax`, or `raw`, found `nomem` --> $DIR/parse-error.rs:103:25 | LL | global_asm!("", options(nomem, FOO)); |                         ^^^^^ expected one of `)`, `att_syntax`, or `raw` error: expected string literal --> $DIR/parse-error.rs:106:29 | LL | global_asm!("", clobber_abi(FOO)); |                             ^^^ not a string literal error: expected one of `)` or `,`, found `FOO` --> $DIR/parse-error.rs:108:33 | LL | global_asm!("", clobber_abi("C" FOO)); |                                 ^^^ expected one of `)` or `,` error: expected string literal --> $DIR/parse-error.rs:110:34 | LL | global_asm!("", clobber_abi("C", FOO)); |                                  ^^^ not a string literal error: `clobber_abi` cannot be used with `global_asm!` --> $DIR/parse-error.rs:112:19 | LL | global_asm!("{}", clobber_abi("C"), const FOO); |                   ^^^^^^^^^^^^^^^^ error: `clobber_abi` cannot be used with `global_asm!` --> $DIR/parse-error.rs:114:28 | LL | global_asm!("", options(), clobber_abi("C")); |                            ^^^^^^^^^^^^^^^^ error: `clobber_abi` cannot be used with `global_asm!` --> $DIR/parse-error.rs:116:30 | LL | global_asm!("{}", options(), clobber_abi("C"), const FOO); |                              ^^^^^^^^^^^^^^^^ error: `clobber_abi` cannot be used with `global_asm!` --> $DIR/parse-error.rs:118:17 | LL | global_asm!("", clobber_abi("C"), clobber_abi("C")); |                 ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^ error: duplicate argument named `a` --> $DIR/parse-error.rs:120:35 | LL | global_asm!("{a}", a = const FOO, a = const BAR); |                    -------------  ^^^^^^^^^^^^^ duplicate argument |                    | |                    previously here error: argument never used --> $DIR/parse-error.rs:120:35 | LL | global_asm!("{a}", a = const FOO, a = const BAR); |                                   ^^^^^^^^^^^^^ argument never used | = help: if this argument is intentionally unused, consider using it in an asm comment: `"/* {1} */"` error: expected one of `clobber_abi`, `const`, `options`, or `sym`, found `""` --> $DIR/parse-error.rs:123:28 | LL | global_asm!("", options(), ""); |                            ^^ expected one of `clobber_abi`, `const`, `options`, or `sym` error: expected one of `clobber_abi`, `const`, `options`, or `sym`, found `"{}"` --> $DIR/parse-error.rs:125:30 | LL | global_asm!("{}", const FOO, "{}", const FOO); |                              ^^^^ expected one of `clobber_abi`, `const`, `options`, or `sym` error: asm template must be a string literal --> $DIR/parse-error.rs:127:13 | LL | global_asm!(format!("{{{}}}", 0), const FOO); |             ^^^^^^^^^^^^^^^^^^^^ | = note: this error originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info) error: asm template must be a string literal --> $DIR/parse-error.rs:129:20 | LL | global_asm!("{1}", format!("{{{}}}", 0), const FOO, const BAR); |                    ^^^^^^^^^^^^^^^^^^^^ | = note: this error originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info) error[E0435]: attempt to use a non-constant value in a constant --> $DIR/parse-error.rs:39:37 | LL |     let mut foo = 0; |     ----------- help: consider using `const` instead of `let`: `const foo` ... LL |         asm!("{}", options(), const foo); |                                     ^^^ non-constant value error[E0435]: attempt to use a non-constant value in a constant --> $DIR/parse-error.rs:49:44 | LL |     let mut foo = 0; |     ----------- help: consider using `const` instead of `let`: `const foo` ... LL |         asm!("{}", clobber_abi("C"), const foo); |                                            ^^^ non-constant value error[E0435]: attempt to use a non-constant value in a constant --> $DIR/parse-error.rs:52:55 | LL |     let mut foo = 0; |     ----------- help: consider using `const` instead of `let`: `const foo` ... LL |         asm!("{}", options(), clobber_abi("C"), const foo); |                                                       ^^^ non-constant value error[E0435]: attempt to use a non-constant value in a constant --> $DIR/parse-error.rs:54:31 | LL |     let mut foo = 0; |     ----------- help: consider using `const` instead of `let`: `const foo` ... LL |         asm!("{a}", a = const foo, a = const bar); |                               ^^^ non-constant value error[E0435]: attempt to use a non-constant value in a constant --> $DIR/parse-error.rs:54:46 | LL |     let mut bar = 0; |     ----------- help: consider using `const` instead of `let`: `const bar` ... LL |         asm!("{a}", a = const foo, a = const bar); |                                              ^^^ non-constant value error[E0435]: attempt to use a non-constant value in a constant --> $DIR/parse-error.rs:61:46 | LL |     let mut bar = 0; |     ----------- help: consider using `const` instead of `let`: `const bar` ... LL |         asm!("{a}", in("eax") foo, a = const bar); |                                              ^^^ non-constant value error[E0435]: attempt to use a non-constant value in a constant --> $DIR/parse-error.rs:63:46 | LL |     let mut bar = 0; |     ----------- help: consider using `const` instead of `let`: `const bar` ... LL |         asm!("{a}", in("eax") foo, a = const bar); |                                              ^^^ non-constant value error[E0435]: attempt to use a non-constant value in a constant --> $DIR/parse-error.rs:65:42 | LL |     let mut bar = 0; |     ----------- help: consider using `const` instead of `let`: `const bar` ... LL |         asm!("{1}", in("eax") foo, const bar); |                                          ^^^ non-constant value error: aborting due to 59 previous errors For more information about this error, try `rustc --explain E0435`. </del>

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