diff --git a/src/action.rs b/src/action.rs
index e71822620..a1b71b0a7 100644
--- a/src/action.rs
+++ b/src/action.rs
@@ -1,3 +1,5 @@
+use std::convert::TryFrom;
+
 #[derive(PartialEq, Debug)]
 pub enum Action {
 	Drop,
@@ -10,20 +12,6 @@ pub enum Action {
 }
 
 impl Action {
-	// TODO move into TryFrom once https://github.com/rust-lang/rust/issues/33417 is in stable
-	pub fn try_from(s: &str) -> Result<Self, String> {
-		match s {
-			"drop" | "d" => Ok(Action::Drop),
-			"edit" | "e" => Ok(Action::Edit),
-			"exec" | "x" => Ok(Action::Exec),
-			"fixup" | "f" => Ok(Action::Fixup),
-			"pick" | "p" => Ok(Action::Pick),
-			"reword" | "r" => Ok(Action::Reword),
-			"squash" | "s" => Ok(Action::Squash),
-			_ => Err(format!("Invalid action: {}", s)),
-		}
-	}
-
 	pub fn as_string(&self) -> String {
 		String::from(match self {
 			Action::Drop => "drop",
@@ -49,9 +37,28 @@ impl Action {
 	}
 }
 
+impl TryFrom<&str> for Action {
+	type Error = String;
+
+	fn try_from(s: &str) -> Result<Self, String> {
+		match s {
+			"drop" | "d" => Ok(Action::Drop),
+			"edit" | "e" => Ok(Action::Edit),
+			"exec" | "x" => Ok(Action::Exec),
+			"fixup" | "f" => Ok(Action::Fixup),
+			"pick" | "p" => Ok(Action::Pick),
+			"reword" | "r" => Ok(Action::Reword),
+			"squash" | "s" => Ok(Action::Squash),
+			_ => Err(format!("Invalid action: {}", s)),
+		}
+	}
+
+}
+
 #[cfg(test)]
 mod tests {
 	use super::Action;
+	use super::TryFrom;
 
 	#[test]
 	fn action_to_str_drop() {
diff --git a/src/color.rs b/src/color.rs
index e089a7229..a022bb673 100644
--- a/src/color.rs
+++ b/src/color.rs
@@ -1,3 +1,5 @@
+use std::convert::TryFrom;
+
 #[derive(Debug, Copy, Clone, PartialEq)]
 pub enum Color {
 	White,
@@ -10,9 +12,10 @@ pub enum Color {
 	Yellow,
 }
 
-impl Color {
-	// TODO move into TryFrom once https://github.com/rust-lang/rust/issues/33417 is in stable
-	pub fn try_from(s: &str) -> Result<Self, String> {
+impl TryFrom<&str> for Color {
+	type Error = String;
+
+	fn try_from(s: &str) -> Result<Self, String> {
 		match s {
 			"black" => Ok(Color::Black),
 			"blue" => Ok(Color::Blue),
@@ -30,6 +33,7 @@ impl Color {
 #[cfg(test)]
 mod tests {
 	use super::Color;
+	use super::TryFrom;
 
 	#[test]
 	fn action_from_str_black() {
diff --git a/src/config.rs b/src/config.rs
index 61f21c59e..2909a8b8f 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -1,4 +1,5 @@
 use crate::color::Color;
+use std::convert::TryFrom;
 use std::{env, ffi::OsString};
 
 #[derive(Debug, Clone)]
diff --git a/src/line.rs b/src/line.rs
index 54d899162..5d501d7d2 100644
--- a/src/line.rs
+++ b/src/line.rs
@@ -1,4 +1,5 @@
 use crate::action::Action;
+use std::convert::TryFrom;
 
 #[derive(PartialEq, Debug)]
 pub struct Line {