Implement parse macro!() / macro![] as expr (RFC 378) #18635
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pnkfelix
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pnkfelix
changed the title
|
Nominating (I suggest P-backcompat-lang, 1.0) |
|
Assigning P-backcompat-lang, 1.0. |
pcwalton
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Nov 19, 2014
followed by a semicolon.
This allows code like `vec![1i, 2, 3].len();` to work.
This breaks code that uses macros as statements without putting
semicolons after them, such as:
fn main() {
...
assert!(a == b)
assert!(c == d)
println(...);
}
It also breaks code that uses macros as items without semicolons:
local_data_key!(foo)
fn main() {
println("hello world")
}
Add semicolons to fix this code. Those two examples can be fixed as
follows:
fn main() {
...
assert!(a == b);
assert!(c == d);
println(...);
}
local_data_key!(foo);
fn main() {
println("hello world")
}
RFC rust-lang#378.
Closes rust-lang#18635.
[breaking-change]
japaric
pushed a commit
to japaric/rust
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this issue
Dec 18, 2014
followed by a semicolon.
This allows code like `vec![1i, 2, 3].len();` to work.
This breaks code that uses macros as statements without putting
semicolons after them, such as:
fn main() {
...
assert!(a == b)
assert!(c == d)
println(...);
}
It also breaks code that uses macros as items without semicolons:
local_data_key!(foo)
fn main() {
println("hello world")
}
Add semicolons to fix this code. Those two examples can be fixed as
follows:
fn main() {
...
assert!(a == b);
assert!(c == d);
println(...);
}
local_data_key!(foo);
fn main() {
println("hello world")
}
RFC rust-lang#378.
Closes rust-lang#18635.
[breaking-change]
bors
added a commit
that referenced
this issue
Dec 18, 2014
followed by a semicolon.
This allows code like `vec![1i, 2, 3].len();` to work.
This breaks code that uses macros as statements without putting
semicolons after them, such as:
fn main() {
...
assert!(a == b)
assert!(c == d)
println(...);
}
It also breaks code that uses macros as items without semicolons:
local_data_key!(foo)
fn main() {
println("hello world")
}
Add semicolons to fix this code. Those two examples can be fixed as
follows:
fn main() {
...
assert!(a == b);
assert!(c == d);
println(...);
}
local_data_key!(foo);
fn main() {
println("hello world")
}
RFC #378.
Closes #18635.
[breaking-change]
---
Rebased version of #18958
r? @alexcrichton
cc @pcwalton
lnicola
pushed a commit
to lnicola/rust
that referenced
this issue
Dec 11, 2024
minor: Fix a test that didn't test what it should
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Tracking issue for RFC 378.
RFC document: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
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