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|
// Test if-else expressions.
---
// Test condition evaluation.
#if 1 < 2 [
One.
]
#if true == false [
{Bad}, but we {dont-care}!
]
---
// Braced condition.
#if {true} [
One.
]
// Template in condition.
#if [] != none [
Two.
]
// Multi-line condition with parens.
#if (
1 + 1
== 1
) [
Nope.
] #else {
"Three."
}
// Multiline.
#if false [
Bad.
] #else {
let point = "."
"Four" + point
}
---
// Value of if expressions.
// Ref: false
{
let x = 1
let y = 2
let z
// Returns if branch.
z = if x < y { "ok" }
test(z, "ok")
// Returns else branch.
z = if x > y { "bad" } else { "ok" }
test(z, "ok")
// Missing else evaluates to none.
z = if x > y { "bad" }
test(z, none)
}
---
// Ref: false
// Condition must be boolean.
// If it isn't, neither branch is evaluated.
// Error: 5-14 expected boolean, found string
#if "a" + "b" { nope } #else { nope }
// Make sure that we don't complain twice.
// Error: 5-12 cannot add integer and string
#if 1 + "2" {}
---
// Error: 4 expected expression
#if
// Error: 4 expected expression
{if}
// Error: 6 expected body
#if x
// Error: 1-6 unexpected keyword `else`
#else {}
// Should output `x`.
// Error: 4 expected expression
#if
x {}
// Should output `something`.
// Error: 6 expected body
#if x something
// Should output `A thing.`
// Error: 20 expected body
A#if false {} #else thing
|
